I put your line in the script and here is the result :

- under NT 4
obj=0 error=-2147221005 : Chaine de classe non valide.
I think that in english it's : "class string not valid".

- under W98
obj=19009232 error=0 : L'opération s'est terminée.
in english : "operation sucessfully completed".

What is the problem ? Is it my COM object that is not correctly written ?