Improve output encoding handling for winget validation in SandboxTest…

….ps1

scripts/archive/misc/SandboxTest.ps1

@@ -295,7 +295,21 @@ if (!$SkipManifestValidation -and ![String]::IsNullOrWhiteSpace($Manifest)) {
         Invoke-CleanExit -ExitCode 3
     }
     Write-Information "--> Validating Manifest"
-    $validateCommandOutput = winget.exe validate $Manifest
+
+
+    $validateCommandOutput = 
+    & {
+        # Store current output encoding setting
+        $prevOutEnc = [Console]::OutputEncoding
+        # Set [Console]::OutputEncoding to UTF-8 since winget uses UTF-8 for output
+        [Console]::OutputEncoding = $OutputEncoding = [System.Text.Utf8Encoding]::new()
+
+        winget.exe validate $Manifest
+
+        # Reset the encoding to the previous values
+        [Console]::OutputEncoding = $prevOutEnc
+    }
+
     switch ($LASTEXITCODE) {
         '-1978335191' {
             ($validateCommandOutput | Select-Object -Skip 1 -SkipLast 1) | Write-Information # Skip the first line and the empty last line