How to execute another program using CATscript

[Kevintp]

Hi,

I need to build a CATScript to execute a process in the background using the following simple code:
=============
Language = "VBSCRIPT"

Sub CATMain()
dim str1 as string
dim return_code as long
dim S as SystemService

Set S = CATIA.SystemService
str1 = "edit c:\temp\test1.txt"

msgbox str1 ' to display the string

S.ExecuteBackgroundProcessus(str1) <- Error: Method ExecuteBackgroundProcessus failed.

End Sub
================
I also tried:
return_code = CATIA.SystemService.ExecuteBackgroundProcessus(str1)
but it also failed.

Can anyone help me to find out what the problem is?
Is there a better way to invoke another program using VBScript from within CATIA?

Thanks a lot