Hi,
As TsungH had instructed, you can use the MoveFile method which will rename the file.
********VB Script to rename the file ***********
Set fso=CreateObject("Scripting.FileSystemObject")
oldFile = "C:\Program Files\msfs.dll"
Set f = fso.GetFile(oldFile)
f.Move "C:\Program Files\msfs.dll_"
set f = Nothing
Set fso = Nothing
***************** End of VB Script ***************
let me know if this helped in some way....