Give BOM to all the source files.

give_bom.ps1

foreach($i in Get-ChildItem -Recurse) {
	if ($i.PSIsContainer) {
		continue
	}

	# You might need some more pattern
	if ($i.FullName -like "*.cc" -or $i.FullName -like "*.h") {
		echo $i.FullName
		$tmp = $i.FullName + ".tmp"
		get-content -Encoding UTF8 $i.FullName | set-content -Encoding UTF8 $tmp
		remove-item $i.FullName
		move-item $tmp $i.FullName
	}
}