For what it's worth, I've found that mapping drives is often not required as many Perl functions such as "glob", "open", "copy", "unlink" and "tempfile" (for example) work fine using Windows UNCs (\\server\share\file). Kind of nice to skip the drive letter mapping altogether.

Note: it's sometimes necessary (if not preferred) to swap back-slashes with slashes in UNCs. (//server/share/file).