Remove BOM from localized files

eng/Localize/RemoveUtf8Bom.ps1

@@ -0,0 +1,20 @@
+# Removes UTF-8 BOM from localized files produced by the XLoc tool.
+# Used via the xLocCustomPowerShellScript input in the OneLocBuild task.
+# The XLocFileList environment variable is set by the task and contains
+# the path to a text file listing all localized files to process.
+
+function RemoveUtf8Bom
+{
+    param(
+        [string]$FilePath
+    )
+
+    $encoding = New-Object -TypeName System.Text.UTF8Encoding -ArgumentList $false
+    $content = Get-Content -Path $FilePath -Encoding UTF8
+    [System.IO.File]::WriteAllText($FilePath, $content -join "`n", $encoding)
+}
+
+foreach ($locFile in (Get-Content -Path $env:XLocFileList))
+{
+    RemoveUtf8Bom -FilePath $locFile
+}

eng/pipelines/templates/pipeline.yml

@@ -67,6 +67,7 @@ stages:
         MirrorRepo: 'NuGet.Client'
         MirrorBranch: ${{ replace(variables['Build.SourceBranch'], 'refs/heads/', '') }}
         GitHubOrg: 'NuGet'
+        xLocCustomPowerShellScript: 'eng/Localize/RemoveUtf8Bom.ps1'
 
 - stage: Build_Insertable
   displayName: Build NuGet inserted into VS and .NET SDK