Found a solution...
..just in case someone else encounters the problem, thought I'd pass along the results of a solution. I guess I should have noted that the directory was created via ftp.
I found an ftp tool ([link|http://www.flashfxp.com/|FlashFXP] that allows you to give raw ftp commands. If you give the command:
MKD foo.bar / /
That will create the directory with a space character on the end. Correspondingly, the directory can be removed by issuing:
RMD foo.bar / /
Kind of stupid that Windows allows the creation of the directory via ftp, but says it's an invalid name when you try to rename or move the directory.
