The code below in LauncgGV.vbs

' Launch GridView
' Wait for GridView to be shut down by the user,
' and display error code returned from GridView when it exits:

Set WshShell = WScript.CreateObject("WScript.Shell")
Return = WshShell.Run("GVWin.exe", 1, true)
MsgBox "Return Code: " & Return

seems to always return 0 as the return code.

Perhaps you could paste your code snippet here so we can have a look.