The XCacls.exe command, without the /E switch, will reset permissions.
 Code:
$Perms = 'userid:C'
$Cmd = 'XCACLS.EXE ' + $File + ' /G Administrators:F SYSTEM:F ' + $Perms

Remember, best practice is to always grant admins & system full control. Outside of home folders, users never get full control on files or folders.

Glenn
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Actually I am a Rocket Scientist! \:D