Chris,

Environment variables will work.. But, you could do the following:
code:
$programloc = READVALUE("HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders","Common Programs")

IF 1 <> EXIST ($programloc+"\RIF Algemeen4\.")
  MD $programloc+"\RIF Algemeen4"
ENDIF
HTH,

Kent
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