I'd like the ability to rename into subfolders. For example:
foobar.blah-coolfile.jpg -> \foobar\blah\coolfile.jpg
I tried just putting in a \, but of course it said that was a non-allowed filename.

And before anyone says it, no, just stripping off the first bit of the filename and then manually moving them into a subfolder will not work. I want to move a couple thousand files into a couple hundred folders.