FYI for you today. Windows has reserved names which it will not let you assign to folders. Try naming a folder to one of the following:
con
com0 (through) com9
lpt0 (through) lpt9
Attempting to do so automatically reverts the folder back to its original name.

David Risley is the founder of PCMech.com. He is the brains, the thinker, the writer, the nerd.
[...] you ever run across a folder with a Windows reserved name, Windows Explorer will not allow you to delete it. This can be a huge annoyance as the folder [...]