Having a problem passing a variable into the call.. the $FullPath is displaying correctly but is not working on the GetFolder call... help.

code:
   	$fso = CreateObject("Scripting.FileSystemObject")
	$FullPath="$DestDir\$FileName"
	?"FullPath: "$FullPath
	$f = $fso.GetFolder($FullPath)
	?"Folder "$f
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Austin Henderson