You can rename files through the use of the FileSystem object. The problem is that you
would expect to find it in the document under a name like Rename. Actually, the functionality
is supplied via the "MoveFile" method. The only technical difference between a file move and a
rename is that a move usually indicates the ability to change the location of the file in addition
to the name.
This code effectively renames the file "test.txt" to "temp.txt":
Set fso = CreateObject("Scripting.FileSystemObject")
fso.MoveFile "test.txt", "temp.txt"