Fix: Run EXE installers from their directory in sideload dialog

[BrandowLucas]

The "Run Installer First" button in the sideload dialog wasn't setting the working directory properly, causing DLL dependencies to not be found. Wine needs the working dir as a Windows path, not Linux path. Changes:

• Added getDirname IPC helper to get directory from file path
• In runWineCommand, convert Linux cwd to Windows path and use cmd /c cd /d to change directory before running
• SideloadDialog now passes the EXE's directory as startFolder

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Use the following Checklist if you have changed something on the Backend or Frontend:

• Tested the feature and it's working on a current and clean install.
• Tested the main App features and they are still working on a current and clean install. (Login, Install, Play, Uninstall, Move games, etc.)
• Created / Updated Tests (If necessary)
• Created / Updated documentation (If necessary)

[flavioislima]

All contributors have signed the CLA ✍️ ✅
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[BrandowLucas]

I have read the CLA Document and I hereby sign the CLA

[BrandowLucas]

recheck

[CommandMC]

Could you clarify what exactly this change achieves? I understand we're not setting the working directory correctly, but DLLs are first searched for in the folder containing the application. The CWD is searched through, but only in a lower priority (reference)

If possible, please provide steps to verify the original issue

[BrandowLucas]

Could you clarify what exactly this change achieves? I understand we're not setting the working directory correctly, but DLLs are first searched for in the folder containing the application. The CWD is searched through, but only in a lower priority (reference)

If possible, please provide steps to verify the original issue

I’m not at home right now, so I can’t provide screenshots. However, without this 5-line patch, selecting the run installer first option causes my mounted DVD game Need for Speed Most Wanted autorun.exe to fail with a DLL error, preventing the setup from continuing.

After applying the patch, the autorun.exe installer launches correctly and proceeds with the installation without any issues.