http://bugs.winehq.org/show_bug.cgi?id=15454
--- Comment #3 from Austin English austinenglish@gmail.com 2008-09-29 15:05:17 --- (In reply to comment #2)
Well, such names sort of illegal in windows (try creating directory or file named test. in Windows - you will fail because Windows strip trailing blanks and dots from filenames), and Wine follows Windows behavior so it cannot use such names too.
Though we might be able to workaround it somehow. Alexandre would know better...