Fix file explorer invocation to ensure correct file selection behavior

Flow.Launcher.Infrastructure/NativeMethods.txt

@@ -57,3 +57,7 @@ LOCALE_TRANSIENT_KEYBOARD1
 LOCALE_TRANSIENT_KEYBOARD2
 LOCALE_TRANSIENT_KEYBOARD3
 LOCALE_TRANSIENT_KEYBOARD4
+
+SHParseDisplayName
+SHOpenFolderAndSelectItems
+CoTaskMemFree

Flow.Launcher.Infrastructure/Win32Helper.cs

@@ -3,6 +3,7 @@
 using System.ComponentModel;
 using System.Diagnostics;
 using System.Globalization;
+using System.IO;
 using System.Linq;
 using System.Runtime.InteropServices;
 using System.Threading;
@@ -15,8 +16,9 @@
 using Microsoft.Win32;
 using Windows.Win32;
 using Windows.Win32.Foundation;
 using Windows.Win32.Graphics.Dwm;
 using Windows.Win32.UI.Input.KeyboardAndMouse;
+using Windows.Win32.UI.Shell.Common;
 using Windows.Win32.UI.WindowsAndMessaging;
 using Point = System.Windows.Point;
 using SystemFonts = System.Windows.SystemFonts;
@@ -38,7 +40,7 @@
         {
             var cloaked = cloak ? 1 : 0;
 
             return PInvoke.DwmSetWindowAttribute(
                 GetWindowHandle(window),
                 DWMWINDOWATTRIBUTE.DWMWA_CLOAK,
                 &cloaked,
@@ -49,10 +51,10 @@
         {
             var backdropType = backdrop switch
             {
                 BackdropTypes.Acrylic => DWM_SYSTEMBACKDROP_TYPE.DWMSBT_TRANSIENTWINDOW,
                 BackdropTypes.Mica => DWM_SYSTEMBACKDROP_TYPE.DWMSBT_MAINWINDOW,
                 BackdropTypes.MicaAlt => DWM_SYSTEMBACKDROP_TYPE.DWMSBT_TABBEDWINDOW,
                 _ => DWM_SYSTEMBACKDROP_TYPE.DWMSBT_AUTO
             };
 
             return PInvoke.DwmSetWindowAttribute(
@@ -753,5 +755,36 @@
         }
 
         #endregion
+
+        #region Explorer
+
+        // https://learn.microsoft.com/en-us/windows/win32/api/shlobj_core/nf-shlobj_core-shopenfolderandselectitems
+
+        public static unsafe void OpenFolderAndSelectFile(string filePath)
+        {
+            ITEMIDLIST* pidlFolder = null;
+            ITEMIDLIST* pidlFile = null;
+
+            var folderPath = Path.GetDirectoryName(filePath);
+
+            try
+            {
+                var hrFolder = PInvoke.SHParseDisplayName(folderPath, null, out pidlFolder, 0, null);
+                if (hrFolder.Failed) throw new COMException("Failed to parse folder path", hrFolder);
+
+                var hrFile = PInvoke.SHParseDisplayName(filePath, null, out pidlFile, 0, null);
+                if (hrFile.Failed) throw new COMException("Failed to parse file path", hrFile);
+
+                var hrSelect = PInvoke.SHOpenFolderAndSelectItems(pidlFolder, 1, &pidlFile, 0);
+                if (hrSelect.Failed) throw new COMException("Failed to open folder and select item", hrSelect);
+            }
+            finally
+            {
+                if (pidlFile != null) PInvoke.CoTaskMemFree(pidlFile);
+                if (pidlFolder != null) PInvoke.CoTaskMemFree(pidlFolder);
+            }
+        }
+
+        #endregion
     }
 }

Flow.Launcher/PublicAPIInstance.cs

@@ -11,7 +11,6 @@
 using System.Threading;
 using System.Threading.Tasks;
 using System.Windows;
-using System.Windows.Input;
 using System.Windows.Media;
 using CommunityToolkit.Mvvm.DependencyInjection;
 using Flow.Launcher.Core;
@@ -319,45 +318,55 @@ public void SavePluginSettings()
 
             ((PluginJsonStorage<T>)_pluginJsonStorages[type]).Save();
         }
-
-        public void OpenDirectory(string DirectoryPath, string FileNameOrFilePath = null)
+        
+        public void OpenDirectory(string directoryPath, string fileNameOrFilePath = null)
         {
             try
             {
-                using var explorer = new Process();
                 var explorerInfo = _settings.CustomExplorer;
                 var explorerPath = explorerInfo.Path.Trim().ToLowerInvariant();
-                var targetPath = FileNameOrFilePath is null
-                    ? DirectoryPath
-                    : Path.IsPathRooted(FileNameOrFilePath)
-                        ? FileNameOrFilePath
-                        : Path.Combine(DirectoryPath, FileNameOrFilePath);
+                var targetPath = fileNameOrFilePath is null
+                    ? directoryPath
+                    : Path.IsPathRooted(fileNameOrFilePath)
+                        ? fileNameOrFilePath
+                        : Path.Combine(directoryPath, fileNameOrFilePath);
 
                 if (Path.GetFileNameWithoutExtension(explorerPath) == "explorer")
                 {
                     // Windows File Manager
-                    explorer.StartInfo = new ProcessStartInfo
+                    if (fileNameOrFilePath is null)
                     {
-                        FileName = targetPath,
-                        UseShellExecute = true
-                    };
+                        // Only Open the directory
+                        using var explorer = new Process();
+                        explorer.StartInfo = new ProcessStartInfo
+                        {
+                            FileName = directoryPath,
+                            UseShellExecute = true
+                        };
+                        explorer.Start();
+                    }
+                    else
+                    {
+                        // Open the directory and select the file
+                        Win32Helper.OpenFolderAndSelectFile(targetPath);
+                    }
                 }
                 else
                 {
                     // Custom File Manager
+                    using var explorer = new Process();
                     explorer.StartInfo = new ProcessStartInfo
                     {
-                        FileName = explorerInfo.Path.Replace("%d", DirectoryPath),
+                        FileName = explorerInfo.Path.Replace("%d", directoryPath),
                         UseShellExecute = true,
-                        Arguments = FileNameOrFilePath is null
-                            ? explorerInfo.DirectoryArgument.Replace("%d", DirectoryPath)
+                        Arguments = fileNameOrFilePath is null
+                            ? explorerInfo.DirectoryArgument.Replace("%d", directoryPath)
                             : explorerInfo.FileArgument
-                                .Replace("%d", DirectoryPath)
+                                .Replace("%d", directoryPath)
                                 .Replace("%f", targetPath)
                     };
+                    explorer.Start();
                 }
-
-                explorer.Start();
             }
             catch (Win32Exception ex) when (ex.NativeErrorCode == 2)
             {
@@ -381,6 +390,7 @@ public void OpenDirectory(string DirectoryPath, string FileNameOrFilePath = null
             }
         }
 
+
         private void OpenUri(Uri uri, bool? inPrivate = null)
         {
             if (uri.Scheme == Uri.UriSchemeHttp || uri.Scheme == Uri.UriSchemeHttps)