RunAsSet and WinXP -> was "msiexec is running on w2k but not on XP"

Maybe you remeber the strange Problem I had with running some files. 
Here is now the code I use to find out what's realy wrong.
If I don't use the RunAsSet function everything works fine. Also the 
script is running on W2k machines. I tried it with a local admin, and 
with a domain admin. Every time the same result:

Line 0 (File "T:\updates\sametime\test.exe");
RunWait($path&"\sametimeclient651.exe")
Error: Unable to execute the external program.
The directory name is not valid   (In German: Der Verzeichnisname ist 
ungültig)

Here is the code:
$path = @ScriptDir
RunAsSet("administrator",@ComputerName,"password",0)
RunWait($path&"\sametimeclient651.exe")
RunAsSet()
 
I am realy confused!

Regards,
Stefan



 
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