Using PowerShell to write a file in UTF-8 without the BOM
$MyFile = Get-Content $MyPath
$MyFile | Out-File -Encoding "UTF8" $MyPath
     
$MyFile = Get-Content $MyPath
$Utf8NoBomEncoding = New-Object System.Text.UTF8Encoding($False)
[System.IO.File]::WriteAllLines($MyPath, $MyFile, $Utf8NoBomEncoding)