http://bugs.winehq.org/show_bug.cgi?id=17403
--- Comment #4 from diafero@arcor.de 2009-09-01 11:32:12 --- Sorry, I was in a hurry when I wrote the last comment. I now tested the demo (downloaded from http://www.gamershell.com/download_4119.shtml because the other link gave a very slow download) and can confirm the issue:
After installing, on the first launch, the game decompresses some (most) of the ogg files (located in gamefolder/sfx) to wav files (in gamefolder/sfx/streamingCache). These wav files are obviously incorrect, as in the game, I do not hear footstep sounds. However I do hear music when approaching the caravan (just one straight forward), which is directly streamed from the ogg file. Copying the wav files from a Windows installation fixes the sound issues.