http://bugs.winehq.org/show_bug.cgi?id=30568
--- Comment #7 from Dmitry Timoshkov dmitry@baikal.ru 2012-05-03 11:40:17 CDT --- (In reply to comment #5)
Created attachment 40013 [details] requested debug log
I ran notepad.exe and pressed numpad "." several times. The period never appeared in notepad, but I see from the log that at least something recognized it.
This is on a US keyboard, using en_US[.UTF-8] layout.
Thanks. It looks like your X11 fails to report correct NumLock state (it reports that it's off, but that shouldn't be the case) and therefore fails to translate XK_KP_Separator because NumLock state in XKeyEvent structure is wrong.