http://bugs.winehq.org/show_bug.cgi?id=18911
--- Comment #1 from Nikolay Sivov bunglehead@gmail.com 2009-06-12 14:32:57 --- Hi, it's most likely about wrong notification format (e.g. NFR_UNICODE used instead of NFR_ANSI) that interprets text strings wrong.
What powerpoint version are you trying?