diff --git a/README.md b/README.md
index 4530bf6d..5a63304f 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,7 @@ You can download the latest stable from [Releases](https://github.com/sourcegit-
 For **Windows** users:
 
 * **MSYS Git is NOT supported**. Please use official [Git for Windows](https://git-scm.com/download/win) instead.
+* You can use `Visual Studio Code Insiders` as the same way as `Visual Studio Code` in this software.
 
 For **macOS** users:
 
@@ -53,6 +54,11 @@ For **Linux** users:
 * Maybe you need to set environment variable `AVALONIA_SCREEN_SCALE_FACTORS`. See https://github.com/AvaloniaUI/Avalonia/wiki/Configuring-X11-per-monitor-DPI. 
 * Modify `SourceGit.desktop.template` (replace SOURCEGIT_LOCAL_FOLDER with real path) and move it into `~/.local/share/applications`.
 
+Other tips:
+
+* You can set `VSCODE_PATH` environment variable if VSCode can NOT be found when you click `Open In Visual Studio Code`.
+* You can set `FLEET_PATH` environment variable if JetBrains Fleet can NOT be found when you click `Open In Fleet`.
+
 ## Screen Shots
 
 * Dark Theme
diff --git a/src/Models/ExternalMergeTools.cs b/src/Models/ExternalMergeTools.cs
index 2ccab1e0..1871faf2 100644
--- a/src/Models/ExternalMergeTools.cs
+++ b/src/Models/ExternalMergeTools.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 
 namespace SourceGit.Models
 {
@@ -19,7 +20,7 @@ namespace SourceGit.Models
             {
                 Supported = new List<ExternalMergeTools>() {
                     new ExternalMergeTools(0, "Custom", "", "", ""),
-                    new ExternalMergeTools(1, "Visual Studio Code", "Code.exe", "-n --wait \"$MERGED\"", "-n --wait --diff \"$LOCAL\" \"$REMOTE\""),
+                    new ExternalMergeTools(1, "Visual Studio Code", "Code.exe;Code - Insiders.exe", "-n --wait \"$MERGED\"", "-n --wait --diff \"$LOCAL\" \"$REMOTE\""),
                     new ExternalMergeTools(2, "Visual Studio 2017/2019", "vsDiffMerge.exe", "\"$REMOTE\" \"$LOCAL\" \"$BASE\" \"$MERGED\" /m", "\"$LOCAL\" \"$REMOTE\""),
                     new ExternalMergeTools(3, "Tortoise Merge", "TortoiseMerge.exe;TortoiseGitMerge.exe", "-base:\"$BASE\" -theirs:\"$REMOTE\" -mine:\"$LOCAL\" -merged:\"$MERGED\"", "-base:\"$LOCAL\" -theirs:\"$REMOTE\""),
                     new ExternalMergeTools(4, "KDiff3", "kdiff3.exe", "\"$REMOTE\" -b \"$BASE\" \"$LOCAL\" -o \"$MERGED\"", "\"$LOCAL\" \"$REMOTE\""),
@@ -62,5 +63,23 @@ namespace SourceGit.Models
             Cmd = cmd;
             DiffCmd = diffCmd;
         }
+
+        public string[] GetPatterns()
+        {
+            if (OperatingSystem.IsWindows())
+            {
+                return Exec.Split(';');
+            }
+            else
+            {
+                var patterns = new List<string>();
+                var choices = Exec.Split(';', StringSplitOptions.RemoveEmptyEntries);
+                foreach (var c in choices)
+                {
+                    patterns.Add(Path.GetFileName(c));
+                }
+                return patterns.ToArray();
+            }
+        }
     }
 }
diff --git a/src/Native/OS.cs b/src/Native/OS.cs
index 6df30c46..004cfc62 100644
--- a/src/Native/OS.cs
+++ b/src/Native/OS.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Diagnostics;
+using System.IO;
 
 using Avalonia;
 
@@ -47,7 +48,12 @@ namespace SourceGit.Native
             }
 
             VSCodeExecutableFile = _backend.FindVSCode();
+            if (string.IsNullOrEmpty(VSCodeExecutableFile))
+                VSCodeExecutableFile = GetPathFromEnvironmentVar("VSCODE_PATH");
+
             FleetExecutableFile = _backend.FindFleet();
+            if (string.IsNullOrEmpty(FleetExecutableFile))
+                FleetExecutableFile = GetPathFromEnvironmentVar("FLEET_PATH");
         }
 
         public static void SetupApp(AppBuilder builder)
@@ -114,6 +120,17 @@ namespace SourceGit.Native
             });
         }
 
+        private static string GetPathFromEnvironmentVar(string key)
+        {
+            var customPath = Environment.GetEnvironmentVariable(key);
+            if (!string.IsNullOrEmpty(customPath) && File.Exists(customPath))
+            {
+                return customPath;
+            }
+
+            return string.Empty;
+        }
+
         private static readonly IBackend _backend;
     }
 }
diff --git a/src/Native/Windows.cs b/src/Native/Windows.cs
index 40a1f856..f026852b 100644
--- a/src/Native/Windows.cs
+++ b/src/Native/Windows.cs
@@ -105,27 +105,52 @@ namespace SourceGit.Native
             }
 
             var exePath = builder.ToString();
-            if (string.IsNullOrEmpty(exePath))
-                return null;
+            if (!string.IsNullOrEmpty(exePath))
+            {
+                return exePath;
+            }
 
-            return exePath;
+            return null;
         }
 
         public string FindVSCode()
         {
-            var root = Microsoft.Win32.RegistryKey.OpenBaseKey(
+            var localMachine = Microsoft.Win32.RegistryKey.OpenBaseKey(
                     Microsoft.Win32.RegistryHive.LocalMachine,
-                    Environment.Is64BitOperatingSystem ? Microsoft.Win32.RegistryView.Registry64 : Microsoft.Win32.RegistryView.Registry32);
+                    Microsoft.Win32.RegistryView.Registry64);
 
-            var vscode = root.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{EA457B21-F73E-494C-ACAB-524FDE069978}_is1");
+            // VSCode (system)
+            var systemVScode = localMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{EA457B21-F73E-494C-ACAB-524FDE069978}_is1");
+            if (systemVScode != null)
+            {
+                return systemVScode.GetValue("DisplayIcon") as string;
+            }
+
+            // VSCode - Insiders (system)
+            var systemVScodeInsiders = localMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{1287CAD5-7C8D-410D-88B9-0D1EE4A83FF2}_is1");
+            if (systemVScodeInsiders != null)
+            {
+                return systemVScodeInsiders.GetValue("DisplayIcon") as string;
+            }
+
+            var currentUser = Microsoft.Win32.RegistryKey.OpenBaseKey(
+                    Microsoft.Win32.RegistryHive.CurrentUser,
+                    Microsoft.Win32.RegistryView.Registry64);
+
+            // VSCode (user)
+            var vscode = currentUser.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{771FD6B0-FA20-440A-A002-3B3BAC16DC50}_is1");
             if (vscode != null)
             {
                 return vscode.GetValue("DisplayIcon") as string;
             }
 
-            var toolPath = Environment.ExpandEnvironmentVariables($"{Environment.GetFolderPath(Environment.SpecialFolder.UserProfile)}\\AppData\\Local\\Programs\\Microsoft VS Code\\Code.exe");
-            if (File.Exists(toolPath))
-                return toolPath;
+            // VSCode - Insiders (user)
+            var vscodeInsiders = currentUser.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{217B4C08-948D-4276-BFBB-BEE930AE5A2C}_is1");
+            if (vscodeInsiders != null)
+            {
+                return vscodeInsiders.GetValue("DisplayIcon") as string;
+            }
+
             return string.Empty;
         }
 
@@ -134,6 +159,7 @@ namespace SourceGit.Native
             var toolPath = Environment.ExpandEnvironmentVariables($"{Environment.GetFolderPath(Environment.SpecialFolder.UserProfile)}\\AppData\\Local\\Programs\\Fleet\\Fleet.exe");
             if (File.Exists(toolPath))
                 return toolPath;
+
             return string.Empty;
         }
 
diff --git a/src/Views/Preference.axaml.cs b/src/Views/Preference.axaml.cs
index 71f4ed48..9dfe9c30 100644
--- a/src/Views/Preference.axaml.cs
+++ b/src/Views/Preference.axaml.cs
@@ -229,10 +229,9 @@ namespace SourceGit.Views
             }
 
             var tool = Models.ExternalMergeTools.Supported[type];
-            var pattern = Path.GetFileName(tool.Exec);
             var options = new FilePickerOpenOptions()
             {
-                FileTypeFilter = [new FilePickerFileType(tool.Name) { Patterns = [pattern] }],
+                FileTypeFilter = [new FilePickerFileType(tool.Name) { Patterns = tool.GetPatterns() }],
                 AllowMultiple = false,
             };