I did read it and i did test it. But still it has nothing to do with the Dir() function and its ability to set @error

Code:

$var = 0
$username = dir("c:\*.*")
While $var < 10 and not @Error
   'var = '+ $var ?
   $var = $var + 1
   If $var = 5
      MessageBox("snookered","Test")
   EndIf
   $userName = dir()
Loop 
? @error
_________________________
Eric