http://bugs.winehq.org/show_bug.cgi?id=5503
--- Comment #34 from Kirill K. Smirnov lich@math.spbu.ru 2007-12-03 10:50:30 --- Could you check for difference wdmain8.hlp which you got under Linux and wdmain8.hlp which you got under Windows. I still suspect the file is broken - internal files |bm372 and |bm373 has invalid size, which is unacceptable for clean help file. It may happen during Office installation process.
The accepted patch which fixed this bug is really just a pedantic check for internal sizes and offsets, so this makes me think that your Linux wdmain8.hlp is broken.
I do not mean that your Office distro in broken, but uncompressed file under Linux.