You really only need to redirect output once...

Code:

$nul = RedirectOutput("h:\user.csv",0)
$GROUPNAME = "Year03"
$group = Getobject("WinNT://@DOMAIN/$GROUPNAME,group")
for each $user in $group.members
 if $user.class = "user"
  ? "Userid: " $user.name
 Endif
next