mdes, thanks for this very useful utility. I ran this on the machine I intend to use it for and I am having a problem. On my C: drive I made 3 files: DRIVE.C DVD.E CDR.F On my D: drive I made a file DRIVE.D I also have a 2-slot Card reader which I really don't care about their letters. I ran the command in Test mode MapDrive ENU TEST c:\ I didn't get any errors however The CD-rom drive letter did not get reported as changed in the log file. Here is the log file Any ideas what may be happening. I downloaded the version listed on the first post dated 5/19/05. I saw mention of a "Beta" version. Is there a Beta version I should be using? Just for the heck of it I tried excluding the letters 'I' through 'Z' to see how it would assign the letters. It STILL "assigned" (log-file) X-Y-Z to the CD-Rom and the two Card reader slots? I made files name DRIVE-.I , Drive-.J, etc. and put them at the root of C:\ (system Drive) and it looks like they weren't even acknowledged by the batch file. I've attached the file. Thanks in advance, TMP_MAPDRIVE.LOG.txt