Version 4.0.5

This is a hotfix version of OCA stable release (4.04) with some improvements. Thanks Murak, Syvatpro and Coccodrillooxds for all work
You can see all improvements in follow list:

What's new:

• Fixed sandbox on 50-109 chromium stopeed work. Is was caused by the chromium detection what was not working in child processes;
• Fixed VMware 10 has an error when starting a virtual machine for the first time on XP x86 SP3;
• Fixed Direct2d;
• Fixed Black screen on games and notepad++. However, it's introduce again some errors;
• Fixed Activation Issue with XP RTM and SP1;
• Adding preliminary support for LH 5000 series;
• New SRW implementation what fix Intellij 2025+ programs;
• Fix Save PNG image on MSPaint;

Known issues:

• Compatibility crash make explorer crash on XP RTM;
• Tor Browser stopped work;
• All Android emulators at new versions not install on all systems;
• Some new git is hanging on Server 2003 and XP 32 bits, however, latest seem working fine;
• VisualCode starting version 1.8.x keep in memory sometimes after close;
• Chrome 111+ and Opera (all version after 36) Sandbox keep not working;
• GameLoop (android emulator) installer get fatal error;
• Java 1.8.191 not install on XP SP3 and Server 2003 x86;
• Some applications like visual code not work on compatibility mode;
• Remote Desktop Connection close on Server 2003 x86;
• WindowBlinds seem not change style;
• Adobe Reader DC not install on XP x64 (seem regression);
• Discord 0.309 is crashing (regression);
• WMP10 not install on XP x86 after OCA installed. due it's verify kernel32 version and we using Windows 10 version lie to support newer Chromium. You need install WMP10 before OCA;
• Steam will crash several times on XP SP3 and get unexpected error on Server 2003 RTM, maybe on LH 5001, XP RTM/SP1. If you get this error, change compatibility from Windows 10 to Windows 7 and start steam again;
• Valve old game from steam crash on XP by libcef issue;
• CCleaner using 50% CPU on Server 2003;
• Some repack installers have problems with title bars (they don't apply the installer's special "themes") in some dialogs;
• DoubleCommander doesn't start because comctl32 requires comctlext;
• Windows Live Messenger of WIndows Live Essentials 2011/2012 Startup has 50% CPU usage ;
• Avast UI is broken;
• Visual Studio 2010 splash screen without text;
• Windows Live Mail from Windows Live Essentials doesn't work;
• Convert Music on iTunes running on XP SP3 doesn't work on OCA 4.0.3+;
• Windows Live Movie Maker from Windows Live Essentials 2009 doesn't start on NT 5.2 because it can't find msvcr80.dll, which is in winsxs. Caused by a hack in the base srv to "bypass" errors in the manifest;
• Skype Classic has no main window;
• RG Mechanics repack no longer works on Server 2003 and XP x64;
• Visual Studio 2003 installer not call itself;
• Telegram 6.x not work;
• WeChat 3.2.1 not working on XP x64;

Version 4.0.4-hotfix

This is a hotfix version of OCA stable release (4.04) with some improvements. Thanks Murak, Syvatpro and Coccodrillooxds for all work
You can see all improvements in follow list:

What's new:

• Fixed Supermium 138 x64 crash tab on some sites on XP x64 by update api-set dlls;
• Fixed VirtualBox 5.x on Windows XP x86 by rollbacking credui.dll;
• Fixed Steam crash on XP x86;
• Updated UiAutomationCore.dll version to prevent override XP x86 update;
• Fixed Steam Installation on XP x64 by updating offline root cert update installation method;
• Update some dlls base addresses to prevent colisions;

Known issues:

• Compatibility crash make explorer crash on XP RTM;
• Tor Browser stopped work;
• All Android emulators at new versions not install on all systems;
• Some new git is hanging on Server 2003 and XP 32 bits, however, latest seem working fine;
• VisualCode starting version 1.8.x keep in memory sometimes after close;
• Chrome 111+ and Opera (all version after 36) Sandbox keep not working;
• Getting error while try install grabber on Xp x64 and Server 2003 x86/x64;
• GameLoop (android emulator) installer get fatal error;
• Java 1.8.191 not install on XP SP3 and Server 2003 x86;
• Some applications like visual code not work on compatibility mode
• Remote Desktop Connection close on Server 2003 x86;
• WindowBlinds seem not change style;
• Adobe Reader DC not install on XP x64 (seem regression);
• OBS report no GPU drivers avaliable;
• Discord 0.309 is crashing (regression);
• WMP10 not install on XP x86 after OCA installed. due it's verify kernel32 version and we using Windows 10 version lie to support newer Chromium. You need install WMP10 before OCA;
• Steam will crash several times on XP SP3 and get unexpected error on Server 2003 RTM, maybe on LH 5001, XP RTM/SP1. If you get this error, change compatibility from Windows 10 to Windows 7 and start steam again;
• Valve old game from steam crash on XP by libcef issue;
• Maybe sandbox on 50-109 chromium stopeed work (regression);
• CCleaner using 50% CPU on Server 2003;
• Some repack installers have problems with title bars (they don't apply the installer's special "themes") in some dialogs;
• DoubleCommander doesn't start because comctl32 requires comctlext;
• Windows Live Messenger of WIndows Live Essentials 2011/2012 Startup has 50% CPU usage ;
• Avast UI is broken;
• Visual Studio 2010 splash screen without text;
• Windows Live Mail from Windows Live Essentials doesn't work;
• Convert Music on iTunes running on XP SP3 doesn't work on OCA 4.0.3+;
• Windows Live Movie Maker from Windows Live Essentials 2009 doesn't start on NT 5.2 because it can't find msvcr80.dll, which is in winsxs. Caused by a hack in the base srv to "bypass" errors in the manifest;
• Skype Classic has no main window;
• VMware 10 has an error when starting a virtual machine for the first time on XP x86 SP3;
• RG Mechanics repack no longer works on Server 2003 and XP x64;
• Visual Studio 2003 installer not call itself;
• Telegram 6.x not work;
• WeChat 3.2.1 not working on XP x64;

Version 4.0.4

Warning

This is not the latest release of One-Core-API. Download the latest release here.

This version will not run as many applications as the latest version.

This is a next OCA stable release with some improvements. Thanks Murak, Syvatpro and Coccodrillooxds for all work
You can see all improvements in follow list:

What's new:

• No more Windows File Protection prompts on any systems (specially x64);
• Fixed icon extraction on XP x64 introduced on version 4.0.3 with png icon support.
• Office 2013 x86 installer closes silently on XP x64 (but keep not installable);
• Fixed wxHexEditor and another applications would not start and caused Explorer to close;
• Fixed SumatraPDF version 2.1.3 open PDF;
• Fixed toolbar on SumatraPDF;
• Fixed toolbar on notepad++;
• WFFontcache 4.0 crashes when trying to open Visual Studio 2010 on XP x64;
• Fixed Visual Code process remains in memory after closing - Only versions above 1.74
• Fix Office 2010 installation on XP x64 by replacing propsys;
• Fix installation of updates that stopped at 4.0.3;
• Fix installation of .NET Framework 3.5 what stopped at 4.0.3;
• Fixing shortcut creation through system updates (shellex)
• Fixing Android Studio 2025 (and probably all JetBrains 2025 apps) by updating the SRW API;
• Updating the SRW API based on ReactOS;
• Adding The Sims 3 support into XP RTM/SP1;
• Fixing x64 SP1 Installation;
• Updating bcrypt to support the new QtCreator;
• Windows Messenger is crashing on x64 if you click "click to sign"
• Now Cert update is offline;
• Fixed Itunes 7.5 on systems;
• Improved compatibility on x86 by using Aclayers from XP x64;
• Improved compatibility and stability with Photoshop 2019-2021;
• Updated bcrypt to support new QtCreator (x64 only);
• Partial support of newer firefox (14x) by add a variable what disable crash reporter);
• Introducing Dwrite_wrapper for dynamic select dwrite (dwritecore for chromium apps and dwrgdi for another applications) and make interoperability with Direct 2d (d2d1);
• Fix Python 3.6.0a and another applications with manifest issue;
• Hack on CompareStringW to fix Python tests and give Prospsys from Windows 7 support;
• Updating credui for Windows 7 beta (6801) to give some new functions;
• Updateing esent with functions required by Windows Live Movie Maker 2011+;
• Fixed IconFx (again);
• Fixed DVD Decrypter ver 3.5.4.0;
• Fixed Windows Calculator from Windows 7 switch mode;

Known issues:

• Compatibility crash make explorer crash on XP RTM;
• Tor Browser stopped work;
• All Android emulators at new versions not install on all systems;
• Some new git is hanging on Server 2003 and XP 32 bits, however, latest seem working fine;
• VisualCode starting version 1.8.x keep in memory sometimes after close;
• Chrome 111+ and Opera (all version after 36) Sandbox keep not working;
• Getting error while try install grabber on Xp x64 and Server 2003 x86/x64;
• GameLoop (android emulator) installer get fatal error;
• Java 1.8.191 not install on XP SP3 and Server 2003 x86;
• Some applications like visual code not work on compatibility mode
• Remote Desktop Connection close on Server 2003 x86;
• WindowBlinds seem not change style;
• Adobe Reader DC not install on XP x64 (seem regression);
• OBS report no GPU drivers avaliable;
• Discord 0.309 is crashing (regression);
• WMP10 not install on XP x86 after OCA installed. due it's verify kernel32 version and we using Windows 10 version lie to support newer Chromium. You need install WMP10 before OCA;
• Steam will crash several times on XP SP3 and get unexpected error on Server 2003 RTM, maybe on LH 5001, XP RTM/SP1. If you get this error, change compatibility from Windows 10 to Windows 7 and start steam again;
• Valve old game from steam crash on XP by libcef issue;
• Maybe sandbox on 50-109 chromium stopeed work (regression);
• CCleaner using 50% CPU on Server 2003;
• Some repack installers have problems with title bars (they don't apply the installer's special "themes") in some dialogs;
• DoubleCommander doesn't start because comctl32 requires comctlext;
• Windows Live Messenger of WIndows Live Essentials 2011/2012 Startup has 50% CPU usage ;
• Avast UI is broken;
• Visual Studio 2010 splash screen without text;
• Windows Live Mail from Windows Live Essentials doesn't work;
• Convert Music on iTunes doesn't work on OCA 4.0.3+;
• Windows Live Movie Maker from Windows Live Essentials 2009 doesn't start on NT 5.2 because it can't find msvcr80.dll, which is in winsxs. Caused by a hack in the base srv to "bypass" errors in the manifest;
• Skype Classic has no main window;
• VMware 10 has an error when starting a virtual machine for the first time on XP x86 SP3;
• RG Mechanics repack no longer works on Server 2003 and XP x64;
• Visual Studio 2003 installer not call itself;
• Telegram 6.x not work;
• WeChat 3.2.1 not working on XP x64;
• Supermium 138 x64 crash tab on some sites;

Version 4.0.3

Warning

This is not the latest release of One-Core-API. Download the latest release here.

This version will not run as many applications as the latest version.

This is a next OCA stable release with some improvements. You can see all improvements in follow list:

What's new:

• Introducing support PNG Icon, like as on Windows Vista. It's fix Notepad++ loadIcon, .Net framework 4.6+ installer (not crash anymore), git 2.4x load icon and possibility several another apps. Also, the icons of installer's git, floorp, librewolf and another programas are displayed correctly. And it will be the base for future LH/Vista/7 Shell packs for XP/2003.. The implementation is on user32_wrapper and use libpng;
• Fixed Chrome 141 crash if click on any button by adding missing function to UIAutomationCore;
• Fixed installation on Server 2003 RTM and OpenXP using custom kernel;
• Fixed Chrome 49 on XP RTM by add SP3 imm32;
• Fixed .Net 4.7.2+ installation by replacing wintrust with vista version (what add sha2 certificates support);
• Fixed parcially d2d1, what fix IconFx missing icons issue;
• Not sure if is introduced on this version, but now Photoshop 2020 run on XP x64, however, always will crash at first try;
• Not sure if is introduced on this version, but now NFS Rivals start on XP;
• Not sure if is introduced on this version, but grabber works fine;
• Not sure if is introduced on this version, but slack seem working;
• Not sure if is introduced on this version, but Windowed seem working;
• Fix for firefox maximize, minimize and close buttons by added Windows 10 Fonts;
• Fixed install printer on XP x64 and Server 2003 x86/x64

Known issues:

• Compatibility crash make explorer crash on XP RTM;
• All Android emulators at new versions not install on all systems;
• Some new git is hanging on Server 2003 and XP 32 bits, however, latest seem working fine;
• Electron apps (like Visual Code) keep in memory after close what seem caused by gpu/wined3d issue. Try add "--disable-gpu" parameter on shortcut and choose "disable gpu acceleration on application settings ;
• VisualCode starting version 1.8.x keep in memory sometimes after close;
• Chrome 111+ and Opera (all version after 36) Sandbox keep not working;
• Getting error while try install grabber on Xp x64 and Server 2003 x86/x64;
• GameLoop (android emulator) installer get fatal error;
• Explorer 32 bits crash if you try start on XP x64;
• Java 1.8.191 not install on XP SP3 and Server 2003 x86;
• Some applications like visual code not work on compatibility mode;
• Remote Desktop Connection close on Server 2003 x86;
• WindowBlinds seem not change style;
• Adobe Reader DC not install on XP x64 (seem regression);
• OBS report no GPU drivers avaliable;
• Discord 0.309 is crashing (regression);
• WMP10 not install on XP x86 after OCA installed. due it's verify kernel32 version and we using Windows 10 version lie to support newer Chromium. You need install WMP10 before OCA;
• Steam will crash several times on XP SP3 and get unexpected error on Server 2003 RTM, maybe on LH 5001, XP RTM/SP1. If you get this error, change compatibility from Windows 10 to Windows 7 and start steam again;
• Valve old game from steam crash on XP by libcef issue;
• Maybe sandbox on 50-109 chromium stopeed work (regression);

Version 4.0.2-Hotfix

Warning

This is not the latest release of One-Core-API. Download the latest release here.

This version will not run as many applications as the latest version.

This is a hotfix OCA stable release for previous OCA release with some improvements. You can see all improvements in follow list:

What's new:

• Fixed not open downloaded files from web by update crypt32 and cryptex;
• Fixed Supermium on NT 5.2 (server 2003 and xp x64) by update ntext, kernelex and shlwapi;
• Updated some binaries to decrease memory usage on XP SP3 and XP x64;
• Fixed dxdiag and dx10 games when use wined3d;
• Fixed .net 4.0+ installation on XP adding loadperf;

Known issues:

• Compatibility crash make explorer crash on XP RTM;
• All Android emulators at new versions not install on all systems;
• Some new git is hanging on Server 2003 and XP 32 bits, however, latest seem working file (except cannot load icon, due is png ico);
• Electron apps (like Visual Code) keep in memory after close what seem caused by gpu/wined3d issue. Try add "--disable-gpu" parameter on shortcut and choose "disable gpu acceleration on application settings ;
• VisualCode starting version 1.8.x keep in memory sometimes after close;
• Chrome 111+ and Opera (all version after 36) Sandbox keep not working;
• Getting error while try install grabber on Xp x64 and Server 2003 x86/x64;
• GameLoop (android emulator) installer get fatal error;
• Explorer 32 bits crash if you try start on XP x64;
• Java 1.8.191 not install on XP SP3 and Server 2003 x86;
• Some applications like visual code not work on compatibility mode;
• Remote Desktop Connection close on Server 2003 x86;
• WindowBlinds seem not change style;
• Netbeans 8.x seem not work on XP/2003 x86;
• Adobe Reader DC not install on XP x64 (seem regression);
• Grabber crash;
• OBS report no GPU drivers avaliable;
• Slack report error on xp/2003 x86 and crash on XP x64 (seem regression);
• Windowed stopped work on xp x64 (regression);
• Newer firefox can not work on XP x86 SP1;
• Discord 0.309 is crashing (regression);
• WMP10 not install on XP x86 after OCA installed. due it's verify kernel32 version and we using Windows 10 version lie to support newer Chromium. You need install WMP10 before OCA;
• Steam will crash several times on XP SP3 and get unexpected error on Server 2003 RTM, maybe on LH 5001, XP RTM/SP1. If you get this error, change compatibility from Windows 10 to Windows 7 and start steam again;
• Valve old game from steam crash on XP by libcef issue;
• Maybe sandbox on 50-109 chromium stopeed work (regression);

Version 4.0.2

Warning

This is not the latest release of One-Core-API. Download the latest release here.

This version will not run as many applications as the latest version.

This is the next OCA stable release with a lot fixes and improvements. You can see all improvements in follow list:

What's new:

• Swapping Wined3d with native D3D runtime from Windows 7 platform update. It's was made to increase stability and compatibility with applications, due wined3d has several issues with Intel , AMD and VirtualBox/Latest VMWARE GPU. However, it is sotfware render, so, very slow and cannot run game;
• Wined3d keep avaliable on (Drive what Windows is installed):\Windows\System32\wined3d. Also, will be released a OCA extra package for install Wined3d and replace native d3d. If you want run a game, make sure has NVIDIA GPU and install or copy files from (Drive what Windows is installed):\Windows\System32\wined3d;
• Replace crypt32 from Vista version. It's fix a lot certificate issues;
• Implemented a checker for if OCA already installed. You need uninstall older version for install new;
• Improve Steam on Server 2003, XP x64 and partially on XP x86. On XP x86 keep highly unstable and keep on investigation. If you know a way to improve stability of Steam, please tell me!;
• Fixed XP x86 memory usage when use a chromium based application, except steam, the memory/virtual memory usage is same than XP and Server 2003;
• Fixed Spotify for Windows 10 missing functions and login; However, seem crash when try play a music or playlist;
• Swapping custom kernel with original untouched kernel to improve stability;
• Replaced dwrite from wine with DwriteCore;
• FIxed Vmware 10 on XP SP3; However, on first vm startup, you will get error. Try again and it will work;
• Fixed VirtualBox on XP x64;
• Fixed VirtualBox VM startup on XP x86;
• FIxed OCA installation on XP x86 SP1;
• Fixed Need for Speed Hot Pursuit 2 and Need for Speed Porsche Unleashed game;
• Fixed Node on XP x86;
• Fixed DOS 16 bits applications on XP and Server 2003;
• Fixed Sony Vegas 10 get error on Startup.
• Fixed Samsung PC Studio;
• Fixed Winamp database error. Very old issue;
• Fixed Avast on XP x86, Server 2003 and XP x64. However, it's seem don't like OCA files, some applications can stop work after AV delete "suspect" files (false positive);
• Introducing a new sandbox disabler, for every chromium based application. You can try enable sandbox adding "-enable-sandbox" parameter on application shortcut;
• FIxed Inno Setup Installer;
• Introducing three OCA x86 installer version: standard, avx and pae. Standard contains original kernel without modification., avx with partial avx support on XP x86 SP3 (patched kernel) and pae, with AVX and PAE patches. PAE version maybe can cause BSODs, be careful;. No changes for Server 2003 and xp x64;
• Fixed 0xDEADBEEF BSOD when use some ported driver what use ntoskrnl_emu;
• Fixed codec issue on XP x64;
• Maybe fixed Hibernation/Sleep issues on x64;
• Fixed missing function on Opera Browser Assistant;
• Now, Opera first tutorial works fine;
• Fixed svchost issue when use Windows Compatibility Tool;
• Chrome 126+ now works on LH 5001, WIndows NCode and systems with MUI Installed;
• Fixed process cmd/wmic creation leak when use legocord or armcord;
• Maybe Fixed issues with BSOD on XP x86 and XP x64;
• Fixed VLC crash when try play a video on VirtualBox;
• Probably fix for Chromium based browsers starting 126 on systems not english;
• Maybe fixed error with sumatra PDF:
• OCA was optimized and now use less VM on Server 2003/XP x64;
• Now you can use wined3d compiled from https://fdossena.com/?p=wined3d/index.frag

Known issues:

• Every downloaded from browser file don't run;
• Compatibility crash make explorer crash on XP RTM;
• All Android emulators at new versions not install on all systems;
• Some new git is hanging on Server 2003 and XP 32 bits, however, latest seem working file (except cannot load icon, due is png icon);
• Electron apps (like Visual Code) keep in memory after close what seem caused by gpu/wined3d issue. Try add "--disable-gpu" parameter on shortcut and choose "disable gpu acceleration on application settings ;
• VisualCode starting version 1.8.x keep in memory sometimes after close;
• Chrome 111+ and Opera (all version after 36) Sandbox keep not working;
• Getting error while try install grabber on Xp x64 and Server 2003 x86/x64;
• GameLoop (android emulator) installer get fatal error;
• Explorer 32 bits crash if you try start on XP x64;
• Java 1.8.191 not install on XP SP3 and Server 2003 x86;
• Some applications like visual code not work on compatibility mode;
• Remote Desktop Connection close on Server 2003 x86;
• WindowBlinds seem not change style;
• Netbeans 8.x seem not work on XP/2003 x86;
• Adobe Reader DC not install on XP x64 (seem regression);
• Grabber crash;
• OBS report no GPU drivers avaliable;
• Slack report error on xp/2003 x86 and crash on XP x64 (seem regression);
• Windowed stopped work on xp x64 (regression);
• Newer firefox can not work on XP x86 SP1;
• Discord 0.309 is crashing (regression);
• WMP10 not install on XP x86 after OCA installed. due it's verify kernel32 version and we using Windows 10 version lie to support newer Chromium. You need install WMP10 before OCA;
• Steam will crash several times on XP SP3 and get unexpected error on Server 2003 RTM, maybe on LH 5001, XP RTM/SP1. If you get this error, change compatibility from Windows 10 to Windows 7 and start steam again;
• Valve old game from steam crash on XP by libcef issue;
• Maybe sandbox on 50-109 chromium stopeed work (regression);

Version 4.0.1

Warning

This is not the latest release of One-Core-API. Download the latest release here.

This version will not run as many applications as the latest version.

This is the next OCA stable release with fixes and improvements. You can see all improvements in follow list:

What's new:

• Reverting Wined3d to version 8.20 to get compatibility with non-3d accelerated GPU, like VirtualBox;
• Fix for Black Screen with mouse on XP x64 and Server 2003;
• Fixed Remote desktop connection visual desconfiguration;
• Fixed notepad from Windows Vista or 7 not search anything;
• Fixed checkbox duplication on Internet Options;
• Fixed Qualcomm Atheros Wifi Driver Code 10 error on xp x64;
• Fixed BSOD 0xDEADBEEF related with ntoskrnl_emu;
• Fixed issues with Longhorn 5001;
• Now uxtheme is patched by default;
• Fix AMD PCNET driver code 10 error on Longhorn 5001;
• Fixed issue with Video on Qemu KVM-Linux;
• Fixed VirtualBox on XP x64;
• Added support for use d3d9 from Vista;
• Fixed Notepad++ not adding context menu entry;
• Fixed Sony Vegas 10 get error on Startup.

Known issues:

• On Some Windows installation languages you can face empty window on MMC applets: you can go to C:\Windows\mui\fallback and detele mmc.exe.mui and mmcbase.dll.mui;
• Compatibility crash make explorer crash on XP RTM;
• All Android emulators at new versions not install on all systems;
• Some new git is hanging on Server 2003 and XP 32 bits, however, latest seem working file (except cannot load icon, due is png icon);
• Virtual Box machines not work on XP SP3 with error on VM startup. And x64 get delay on operations ;
• Electron apps (like Visual Code) keep in memory after close what seem caused by gpu/wined3d issue. Try add "--disable-gpu" parameter on shortcut and choose "disable gpu acceleration on application settings ;
• VisualCode starting version 1.8.x keep in memory sometimes after close;
• Chrome 111+ and Opera (all version after 36) Sandbox keep not working;
• Getting error while try install grabber on Xp x64 and Server 2003 x86/x64;
• GameLoop (android emulator) installer get fatal error;
• Explorer 32 bits crash if you try start on XP x64;
• Java 1.8.191 not install on XP SP3 and Server 2003 x86;
• XP SP3 maybe get BSOD in Core 2 duo generation notebooks;
• Some applications like visual code not work on compatibility mode;
• Remote Desktop Connection close on Server 2003 x86;
• Chromium based applications on XP SP3 only has virtual memory optimization only at second time of you start application;

Version 4.0.0

Warning

This is not the latest release of One-Core-API. Download the latest release here.

Download the latest release above to run more applications. Older versions have unresolved bugs and will run less applications than the new version.

This is a biggest OCA release ever. One more time, thank you so much Murak, which found out the reasons for many apps failing, help-me a lot to port several good features and to improve speed, stability and secutiry of OCA. Thanks too to Svyatpro, my old Betaarchive's friend, responsable by compile wined3d to OCA with several improvements and magic tricks. We have a lot news. Now, the compatiblity with installers improved a lot, the browser compatibility is almost complete. The OCA is now much more stable, the installation process is much more easy, stable and fast. We almost back entirely programming on XP, and compatibility with all applications types was improved. This release was worked about one year and now all NT 5.1 and NT 5.2 release are supported (RTM-SP3, RTM-SP2). You can see all improvements in follow list:

What's new:

• Introducing the Windows Compatibility Tool, a tool for emulate Windows version globally;
• Now OCA has one main installer. Driver package was moved to OCA Extras, and you only need install one package for get main OCA features;
• And speaking of FLS implementation, it also fixes the TightVNC program on Windows XP.
• Hack removal for Chrome versions starting from version 88;
• Remove dependency of FLS functions from kernelbase on Server 2003 and XP x64;
• Fixing firefox installer of versions 89-100~ on Windows XP;
• Firefox online installer now is support on updated Server 2003 SP2 and XP SP3 (really latest updates);
• Memory usage of chromium applications now in Wow64 too by changing the base address of some dlls;
• Fixing GIMP installler of version 2.8-2.99 on XP, Server 2003 and XP x64 by changing base address;
• Fixing dwrite failures by updated version from Wine ;
• Full support for Visual Studio 2012 installer and program (using Windows Compatibiity Tool);
• Full support for VIsual Studio 2013 and 2015 Installer, however, half support for the programs in true (using Windows Compatibiity Tool);
• Fixed Spotify for Windows 7 both XP and Server 2003 and fixed installer on Server 2003 and XP x64;
• Fixed Spotify for Windows 10 for both XP and Server 2003, however, you cannot login due don't open browser;
• Several applications what require Administrator rights prompt "Run as" dialog and you just just uncheck "run program with limited access";
• Paint .net 4.0.x now can be installed on Xp, however, need install D3D Native Package and set compatbility mode by NNN4NT5 or Windows Compatibility Tool;
• Added some functions into esent.dll, what now you can run spotify, steam (without login work yet) and several others Chrome Embbeded aplications now fixed;
• Added some functions into powrprof to support LeagueDisplay;
• Due already integrated native dwrite, now telegram works like a charm on Xp, 2003 and XP x64, zoom and all Opera 39-49 too (however, between Opera 39-49, maybe you need add "--disable-gpu" to shortcut parameter;
• Fixed Microsoft Visual Studio 2010 installer has glitches on texts and messages and installation on XP x86 and x64. Server 2003 keep failling to install SQL Server 2008;
• Fixed warning message when click in service on services.msc in XP x64;
• Introducing support for ALL edge versions. Before, only versions 102-132 (latest on release's date) were supported. This was made possible through fixes in the kernelbase, which especially had an incorrect function, and the implementation of the FLS API mechanism in XP. Also on Wiindows Server 2003 and XP x64 the entire versions are supported;
• Increasing support for Chrome to latest version 133;
• Increasing support for Firefox to latest version 133. Youtube was fixed between versions 55-130. And live stream works by ported Windows Media Foundation;
• Increasing support for Opera 114;
• Introducing support for Tor brower;
• Fixing Visual Code on Server 2003 x86/x64 and XP x64 and support for latest versions, including Codium (visual studio fork);
• Fixing Server 2003 BSOD after installing some updates and modifying registry;
• Fixing BSOD while install Virtual Box tools on XP x64 (installed as virtualbox vm);
• Fixing BSOD installing VirtualBox on Xp x64;
• Correct installation of VirtualBox on all systems;
• Fix for Session manager x64 BSOD in all cases;
• Updated WineD3D to 9.8, fixed PowerShell ISE black screen and correction of its dwrite, which now allows zoom, grabber, telagram and others to work;
• Fixed BSOD on x64 and others when installing the BRfs driver;
• Fixing Chrome 49 sandbox;
• Bringing Sandbox support for Chrome 51-109, Edge from 75-109 and other browsers and electron based applications. However, opera sandbox keep not working. To get Sandbox working on listed version, just rename executable to other name, like change chrome.exe to chromex.exe;
• Now Opera installer work until latest version. For uninstall, you must need set Windows 7 compatibility on opera.exe;
• Now Chrome/Chromium ministaller is almost entirely working;
• Now Chrome installer until version 109 works by using Windows Compatibility Tool;
• Installer of Edge 75-109 is working and maybe ministaller (if avaliable) seem working, by using Windows Compatibility Tool;
• WinCdEmu fails to install the driver on x64 with error E0000D22 (setupapibase reverted to the original XP x64 version, needs further analysis to return to using 4074 or 5112);
• Some .Net (no .net framework) applications now works;
• Added support for Firefox nightly;
• Fixed Gajim crashing on startup [https://github.com//issues/277]
• Full compatibility with Server 2003 "extended updates" seen in unofficial "2003/XP64 SP3" ISOs;
• Worked around Paint.Net crash on startup issue;
• Fixed TightVNC [#xx] (remove if not fixed) ;
• Incluing rsa/dss/schannel files from latest version avaliable for each system to try get support for Tls/SLL 1.2+ (however, maybe not working yet)
• Including winttp.dll from Vista Sp2, maybe fix some installations and download.
• Jre 1.8.152 installer is working on XP/2003;
• Fixed Windows Live Essentials 2009 and SQL Server 2014 installer crash on Server 2003;
• Fixed Black Box game repack installers get a error during installation on Server 2003;
• Fixing If you try uninstall Base Package before Driver update or Additional Dlls, you may get a BSOD;
• Added slimjet, opera launcher, visual codium to sandbox whitelist;
• Mouse seem working after install VirtualBox tools and OCA;
• Creation of folder "SystemTemp" on Windows folder to prevent leak of creation several folders on program and files folder when using chrome 110+ and all based browsers;
• Line install and work;
• Support for latest git version;
• Fix BSOD if you try use Win32ss 5048 package on 2003. However, x64 keep getting some BSOD;
• Fix for PCSX2;
• Fixed all Windows Protection Files Warning Dialogs when install on all Windows supported versions;
• Introduce support for Steam, including Windows 10 version. Now, we can loggin. download and run games. However, several games depends of Third Game Launchers, what maybe not supported yet. Also, Old valve games (CS 1.6, Half-Life. etc) seem getting a error on startup; If steam fail with crashing steamwebhelper, try add too: --disable-gpu;
• Increasing support for JetBrains Applications (Intelij, Android Studio, PyCharm, WebStorm, etc) up to version 2024.
• Introduced support for latest Eclipse IDE version;
• Introduced support for latest Netbeans;
• Introduced support for Postman (x64) and need NNN4NT5 or Windows Compatibility Tool to install;
• Introduced support for Insominia (x64) and need NNN4NT5 or Windows Compatibility Tool to install;
• Introduced support for qBitorrent for latest version;
• Some fixes for VirtualBox, however, keep not start VM on XP x86;
• Fixed Visual code 1.22 and 1.53;
• Added d3d12 to D3D Runtime Package to provide support for OBS 30;
• Added support for OBS 28-30;
• Full support for QT6. However, you can face with some applications fails, caused by lack AVX support. If you disable AVX on VM, the applications will run. On Real machine, need use a non-AVX pc based;
• Fixed WMI (Windows Management Intrumentation). It will be .net framework installation work fine;
• Fixed getmac hang issue, mainly when try open old visual studio code;
• Added Postman, Insominia, CcleanerBrowser to sandbox whitelist. Also, these applications work at latest version;
• Included progwrp to OCA. It's make supermium work without any tricks;
• Slightly better Java 9+ networking support;
• Some User and System variables introduced, like PROGRANDATA and LOCALAPPDATA, and others like; disable java ipv6 enforcement, disable node OS verification and a net core to improve compatibility;
• .NET 7/8 memory usage workarounds;
• Furmark run fine at latest version;
• Node 16 (what was tested) work fine. However, the installer no;
• This is a hotfix release from the previous release. However, introduce almost complete support for QT6 apps;
• Updating some dlls needed to support propertly QT6 apps;
• Tested TeamSpeek 3 and seem work on XP;
• Introducing Windows 8 codecs, like windows 7. it's provide multithreading and image support in IE10 Preview 1. NOTE: Installing WIC causes PNG support to break. Just install OneCoreAPI a second time if that happens;
• Introducing Windows 8 gdiplus, what include GDI+ 1.1 while keeping support with GDI+ 1.0 application .for support new apps, like office 2013+;
• Sandbox support has been extended to include Chromium 90 to 110 and Electron software up to 23-based versions.
  NOTE: Chromium 110 sandbox might have unexpected issues. Stick with Chromium 109 o...

Version 3.0.5

Warning

This is not the latest release of One-Core-API. Download the latest release here.

Download the latest release above to run more applications. Older versions have unresolved bugs and will run less applications than the new version.

One more time, thank you so much Murak, which found out the reasons for many apps failing. We have some news, now, Edge 116-121 working! Firefox support for 116-121 was introduced too! Introducing for modern Open/Save Dialog, what fixes several applications, including browsers. Introducing support for modern applications on wow64, 32 bits appliations on XP/2003 x64. Now, you can use the latest chrome/firefox/edge/opera/custom chromium 32 bits on XP x64. Optimized performance on Server 2003 x86, half on XP x86 and on wow64 on XP x64.

What's new:

• Introducing support for modern applications 32 bits on Wow64 in Windows XP/2003 x64. Now, we can Chrome, Edge, Firefox, Spotify, Visual Code, Opera of latest versions;
• Optimized memory usage with chromium applications on Server 2003 x86 and Wow64 on XP/2003 x64. XP x86 has a HALF optimization: due kernel memory management issue, you need a trick:
  • Start chromium application (chrome, edge, opera, visual code, etc) first time then close;
  • Start a second time, and getting a smoth memory usage.
  • Memory usage will always be like this: once high, next time low, next time high, next time low. The reason is under investigation;
• Introducing of almost IFileDialog implementation on XP/2003. The IFileDialog was introduced on Vista, to replace older APIs, GetSaveFileName and GetOpenfilename, used to choose where and put a name of file to open/save. Several applications require that implatation, like: Visual Studio Code, Palemoon, Modern chrome, Edge, Opera and all Chromium based browsers, Windows 7 Wordpad, Vista Movie Maker, Modern Notepad++, and others;
• Introducing support for Edge 116 - 122;
• Introducing support for Firefox 117-121;
• Introducing HALF support for latest Spotify, even Windows 10 version. However, some notes: you will get a error by Error reporting: just ignore. The Windows 10 version force try open login on browser, but seem not working. So, i recommend install Windows 7 version first, login and so, upgrade (if you want). And finally, Windows 7 version seem not loading some info in dashboard. Like Steam, you MUST need copy esent.dll from Windows Vista/7;
• Introducing half support for Steam. Fixing "Failed To Load steamui.dll". The application now start, you need do somethings; replace esent.dll from Windows 7 and add "-cef-disable-sandbox" to steam shortcut. However, you cannot login for now. Under investigation;
• Basilisk, Palemoon for Windows 7 or for XP now working fine again;
• Issue of click on a service on Services.msc, you get a message with error before the dialog open fixed;
• Clean Flash Player seem working on all platform and windows version supported;
• Issues during navigation on google maps and other sites seem fixed on chromium browsers;
• Added AmdPPM driver;
• Adding multilanguage support for dxdiag;
• Fixed NotepadEx on Open/Save action;
• Windows XP kernel was updated with Server 2003 Syscalls and some functions.
• Disabled new HD audio from Vista to prevent no sound
• LibreOffice 6.0+ now working fully and fine. However, starting version 7.6 (not tested between 7.0 and 7.6), need native dwrite;

Known issues:

• Gimp 2.8+ installer not working. Get "Out of memory" error;
• Discovered the reason of Chromium and based browsers memory leak: Seem dlls with no base address. Under in investigation;
• Chrome 110+ x64 use reserve a excessively reserves memory, since Windows 8.1's memory management was modified and as it is an application that only supports Windows 10+, it started using this management. So, you may face astronomical memory usage. The solution is to use the 32-bit version. It's under investigation;
• Chromium 49 and maybe below sandbox not working. Under in investigation;
• Driver Update package has a updated HD audio and maybe cause not audio device;
• Some applications what require Administrator rights prompt "Run as" dialog and cannot be installed, stuck the installation;
• Gimp 2.10-2.99 installer get a extraction error on server 2003;
• Black Box game repack installers get a error during installation;
• If you try uninstall Base Package before Driver update or Additional Dlls, you may get a BSOD;
• Base Installer frozen install if you uninstall and install again. The workaround is terminate the SCHTASKS process on task manager;
• Speccy installer has wrong behavior on Windows XP and not install right. And both Windows XP, Server 2003 and XP x64 not work when load, generating a error;
• Microsoft Visual Studio 2010 installer has glitches on texts and messages;
• Paint.net 3.5.11 generate an unhandled error at startup on Windows XP/Server 2003;
• Java 1.8.191 not install on XP SP3 and Server 2003 x86;

Version 3.0.4

Warning

This is not the latest release of One-Core-API. Download the latest release here.

Download the latest release above to run more applications. Older versions have unresolved bugs and will run less applications than the new version.

One more time, thank you so much Murak, which found out the reasons for many apps failing. Now chromium/chrome version up 122 is working, Edge up version 115, Opera latest and other chromium based browsers, with downloads working fine! Firefox support increased up version 116! Visual Studio code and Skype now create shortcut without "Interface not supported" at compatbility mode. See all new features.

What's new:

• Fully Chrome and Chromium 122 browser. Now, we have latest chrome support, like Windows 10;
• Microsoft Edge support increased up to version 115;
• Opera support increased up to version 105;
• Support latest for Vivaldi, Brave and others chromium based browsers;
• Firefox support increased up to version 116 and sandbox is disabled by default with builtin a user variable. Don't need add User environment variables (only if get a better support), But, follow env varable are avaliable to improve support:
• MOZ_DISABLE_CONTENT_SANDBOX
• MOZ_DISABLE_GMP_SANDBOX
• MOZ_DISABLE_GPU_SANDBOX
• MOZ_DISABLE_NPAPI_SANDBOX
• MOZ_DISABLE_RDD_SANDBOX
• MOZ_DISABLE_SOCKET_PROCESS_SANDBOX
• MOZ_FORCE_DISABLE_E10S
• Thunderbird support increased to 115;
• Reversed Dwrite to wine because Vista/Windows 7 Plataform Update Dwrite not work with latest chrome version;
• Partial support for Office 2013 installation. Keep failing at end, but, now, try install. Some componentes, like Word, work better with usp10 update;
• Added some functions to OneDriver, however, keep not working;
• Fixing office 2007/2010 fail installation on Server 2003 x86/x64;
• Completely rewrite of SRW and ConditionVariable API using XPExpert (https://github.com/zeroclear/xpext) for SRW and YY-Thunks(https://github.com/Chuyu-Team/YY-Thunks) for ConditionVariable. Thanks for both. It's seem fix Firefox download for every version after 54, fix Edge 115 and several other things; Now, wine tests for sync has only 1 failure, before 11 or more. It's maybe fix several other applications;
• Completely rewrite of D3DKMTCREATEDCFROMMEMORY. Native Directx 11 runtime up to Windows 8 now work with restrictions on XP/2003. It's use a software warp device, good for simple/medium tasks, but very slower to gaming. A native package will be relased on One-Core-API-Extras ;
• Chromium and based applications now descreased several megabytes on Server 2003 by default and on XP/XP x64 at compatbility mode. In invesgation the behavior on XP/XP x64;
• Server 2003/XP x64 Activation now seem fixed. Please test again;
• Maybe BSOD on Core 2 Duo platform with XP could fixed by inclusing of intelppm from XP SP2. Need test;
• Firefox download seem work fine now. Youtube seem work fine on real hardware if use Directx native. Palemon download work, with some restrictions, maybe need choose place to download, and new open/save under in impletation;
• Visual Studio Code, Skype and other application what need run in compatbility mode now create shortcut without problem. Before got a erro: "Interface not supported".However, if you use NNN4NT5 for Compatibility with Vista+, explorer will got some errors with quick launch:
  On Server 2003/XP x64, it's increase to much the quick launch width. Need unlock taskbar and resize manually;
  On XP, always get quick launch disabled on reboot;
• Added PowerWriteSettingsAttributes for powrprof.dll to get LeagueDisplay working (untested);
• Legacy Update seem work, tested 1.9;
• Opera 39~60 installer now create shortcut and open opera at end;

Known issues:

• Discovered the reason of Chromium and based browsers memory leak: Seem dlls with no base address. Under in investigation;
• Chromium 49 and maybe below sandbox not working. Under in investigation;
• Driver Update package has a updated HD audio and maybe cause not audio device;
• Some applications what require Administrator rights prompt "Run as" dialog and cannot be installed, stuck the installation;
• Gimp 2.10-2.99 installer get a extraction error on server 2003;
• Black Box game repack installers get a error during installation;
• If you click on a service on Services.msc, you get a message with error before the dialog open;
• If you try uninstall Base Package before Driver update or Additional Dlls, you may get a BSOD;
• Base Installer frozen install if you uninstall and install again. The workaround is terminate the SCHTASKS process on task manager;
• Speccy installer has wrong behavior on Windows XP and not install right. And both Windows XP, Server 2003 and XP x64 not work when load, generating a error;
• Microsoft Visual Studio 2010 installer has glitches on texts and messages;
• Paint.net 3.5.11 generate an unhandled error at startup on Windows XP/Server 2003;
• Java 1.8.191 not install on XP SP3 and Server 2003 x86;