Um, is there a question here?

Creating a dropdown list is pretty straight-forward in Tk and knowing your past postings I'm sure you can competantly do that. If you're wanting a quick way to get the list of mapped drive letters on Windows, look at Win32::DriveInfo. It has that capability (and the inverse list too). It'll even let you determine if the drive is writeable, etcetera if you'd like that info too.

- - arden.