BOM (Byte Order Mask) is a characteristic byte sequence used in some Unicode encoded text files. If you receive text files with BOM that need to be processed by systems not supporting BOM, here is a way how PowerShell can remove the BOM from such files:
function Remove-BomFromFile ($OldPath, $NewPath)
$Content = Get-Content $OldPath -Raw
$Utf8NoBomEncoding = New-Object System.Text.UTF8Encoding $False
[IO.File]::WriteAllLines($NewPath, $Content, $Utf8NoBomEncoding)
Now it is trivial to take a file with BOM and turn it into a BOM-free file:
$Path = "$env:temp\export.csv"
$NewPath = "$env:temp\export_new.csv"
Remove-BomFromFile -OldPath $Path -NewPath $NewPath
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