Fix workflow: use correct solution file for build

Updated SOLUTION_PATH in build-and-release.yml to reference the correct solution file, PingTool.WinUI3.sln, instead of the non-existent Ping-Tool.sln. Added WORKFLOW_FIX.md to document the issue, root cause, and resolution steps. This ensures the GitHub Actions workflow builds and releases the intended WinUI3 project.

Author: avikeid2007

.github/workflows/build-and-release.yml

@@ -12,7 +12,7 @@ on:
 env:
   DOTNET_VERSION: '8.0.x'
   PROJECT_PATH: 'PingTool.WinUI3/PingTool.WinUI3.csproj'
-  SOLUTION_PATH: 'Ping-Tool.sln'
+  SOLUTION_PATH: 'PingTool.WinUI3.sln'
 
 jobs:
   build-msix-bundle:

WORKFLOW_FIX.md

@@ -0,0 +1,69 @@
+# GitHub Actions Workflow Fix
+
+## Issue
+
+The GitHub Actions workflow was failing with the error:
+
+```
+MSBUILD : error MSB1009: Project file does not exist.
+Switch: Ping-Tool.sln
+```
+
+## Root Cause
+
+The workflow file (`.github/workflows/build-and-release.yml`) was referencing an incorrect solution file name:
+
+**Incorrect**: `Ping-Tool.sln`  
+**Correct**: `PingTool.WinUI3.sln`
+
+## Solution
+
+Updated the `SOLUTION_PATH` environment variable in `.github/workflows/build-and-release.yml`:
+
+```yaml
+env:
+  DOTNET_VERSION: '8.0.x'
+  PROJECT_PATH: 'PingTool.WinUI3/PingTool.WinUI3.csproj'
+  SOLUTION_PATH: 'PingTool.WinUI3.sln'  # Fixed from 'Ping-Tool.sln'
+```
+
+## Available Solution Files
+
+The repository contains two solution files:
+- `PingTool.sln` - Legacy/old solution
+- `PingTool.WinUI3.sln` - **Current WinUI3 solution (correct one)**
+
+The WinUI3 solution is the active one for the migration and should be used for all builds.
+
+## Verification
+
+1. ? Local build successful
+2. ? Solution file path verified: `PingTool.WinUI3.sln` exists in repository root
+3. ? Project file path correct: `PingTool.WinUI3/PingTool.WinUI3.csproj`
+4. ? Solution contains the WinUI3 project
+
+## Testing
+
+After pushing this change, the GitHub Actions workflow should:
+- ? Successfully restore NuGet packages
+- ? Build MSIX bundle for all platforms (x86, x64, ARM64)
+- ? Build traditional installer
+- ? Create releases on version tags
+
+## Files Modified
+
+- `.github/workflows/build-and-release.yml` - Fixed `SOLUTION_PATH` variable to `PingTool.WinUI3.sln`
+
+## Next Steps
+
+1. Commit and push the fix
+2. Monitor the GitHub Actions workflow run
+3. Verify all jobs complete successfully
+4. Proceed with normal release process
+
+---
+
+**Fixed by**: GitHub Copilot  
+**Date**: January 2026  
+**Related Issue**: GitHub Actions build failure on branch push  
+**Corrected Solution**: PingTool.WinUI3.sln (not PingTool.sln)