From 62879d87c59eb0f324f2ce458f6eb6206e154bfd Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 22 May 2025 08:31:45 +0000
Subject: [PATCH 1/3] Initial plan for issue


From b52bc1109b82e0b3c8c72085f7172deadfd505a4 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 22 May 2025 08:35:06 +0000
Subject: [PATCH 2/3] Add try-catch for Environment.SetEnvironmentVariable in
 UndockedRegFreeWinRT

Co-authored-by: haonanttt <186026394+haonanttt@users.noreply.github.com>
---
 BuildAll.ps1                                      |  0
 .../UndockedRegFreeWinRT-AutoInitializer.cs       | 15 ++++++++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)
 mode change 100644 => 100755 BuildAll.ps1

diff --git a/BuildAll.ps1 b/BuildAll.ps1
old mode 100644
new mode 100755
diff --git a/dev/UndockedRegFreeWinRT/UndockedRegFreeWinRT-AutoInitializer.cs b/dev/UndockedRegFreeWinRT/UndockedRegFreeWinRT-AutoInitializer.cs
index 2e07c542..7b6e0dac 100644
--- a/dev/UndockedRegFreeWinRT/UndockedRegFreeWinRT-AutoInitializer.cs
+++ b/dev/UndockedRegFreeWinRT/UndockedRegFreeWinRT-AutoInitializer.cs
@@ -24,7 +24,20 @@ class AutoInitialize
         internal static void AccessWindowsAppSDK()
         {
             // Set base directory env var for PublishSingleFile support (referenced by SxS redirection)
-            Environment.SetEnvironmentVariable("MICROSOFT_WINDOWSAPPRUNTIME_BASE_DIRECTORY", AppContext.BaseDirectory);
+            try
+            {
+                Environment.SetEnvironmentVariable("MICROSOFT_WINDOWSAPPRUNTIME_BASE_DIRECTORY", AppContext.BaseDirectory);
+            }
+            catch (System.MissingMethodException)
+            {
+                // Gracefully handle the case when Environment.SetEnvironmentVariable is not available
+                // This can happen in trimmed environments (PublishTrimmed=true)
+                // Continue execution as it's better than crashing the application
+            }
+            catch (System.Exception)
+            {
+                // Catch any other unexpected exceptions to ensure application doesn't crash
+            }
 
             // No error handling needed as the target function does nothing (just {return S_OK}).
             // It's the act of calling the function causing the DllImport to load the DLL that

From ceb2aefad899a0847f84b0133521410bb8dc1f1c Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 22 May 2025 08:35:52 +0000
Subject: [PATCH 3/3] Add Win32 SetEnvironmentVariable fallback in
 UndockedRegFreeWinRT

Co-authored-by: haonanttt <186026394+haonanttt@users.noreply.github.com>
---
 .../UndockedRegFreeWinRT-AutoInitializer.cs   | 26 +++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/dev/UndockedRegFreeWinRT/UndockedRegFreeWinRT-AutoInitializer.cs b/dev/UndockedRegFreeWinRT/UndockedRegFreeWinRT-AutoInitializer.cs
index 7b6e0dac..70d0c100 100644
--- a/dev/UndockedRegFreeWinRT/UndockedRegFreeWinRT-AutoInitializer.cs
+++ b/dev/UndockedRegFreeWinRT/UndockedRegFreeWinRT-AutoInitializer.cs
@@ -16,6 +16,11 @@ internal static class NativeMethods
     {
         [DllImport("Microsoft.WindowsAppRuntime.dll", CharSet = CharSet.Unicode, ExactSpelling = true)]
         internal static extern int WindowsAppRuntime_EnsureIsLoaded();
+        
+        // Direct Win32 API call to set environment variable as fallback
+        [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
+        [return: MarshalAs(UnmanagedType.Bool)]
+        internal static extern bool SetEnvironmentVariableW(string name, string value);
     }
 
     class AutoInitialize
@@ -30,13 +35,30 @@ internal static void AccessWindowsAppSDK()
             }
             catch (System.MissingMethodException)
             {
-                // Gracefully handle the case when Environment.SetEnvironmentVariable is not available
+                // Fallback: Use direct Win32 API call when Environment.SetEnvironmentVariable is not available
                 // This can happen in trimmed environments (PublishTrimmed=true)
-                // Continue execution as it's better than crashing the application
+                try
+                {
+                    NativeMethods.SetEnvironmentVariableW("MICROSOFT_WINDOWSAPPRUNTIME_BASE_DIRECTORY", AppContext.BaseDirectory);
+                }
+                catch
+                {
+                    // Ignore failures in the fallback path - continue execution
+                    // as it's better than crashing the application
+                }
             }
             catch (System.Exception)
             {
                 // Catch any other unexpected exceptions to ensure application doesn't crash
+                // Try the fallback mechanism
+                try
+                {
+                    NativeMethods.SetEnvironmentVariableW("MICROSOFT_WINDOWSAPPRUNTIME_BASE_DIRECTORY", AppContext.BaseDirectory);
+                }
+                catch
+                {
+                    // Ignore failures in the fallback path
+                }
             }
 
             // No error handling needed as the target function does nothing (just {return S_OK}).