http://bugs.winehq.org/show_bug.cgi?id=18910
--- Comment #2 from Jan Hoogenraad jan-winehq@h-i-s.nl 2010-04-25 05:38:26 --- Currently, opening the save as dialog responds with: An unexpected error occurred: I/O error 0.
Powerpoint seems to respond that way now for any version from 1.23 till the current git.
This behavior started a week ago, using wine-1.1.33 (the latest were other regressions were not present).