I recently migrated our drupal 4.6.6 site to a web host running Windows IIS and have had no end to the problems ...but anyways the one I'm currently trying to fix has to do with the audio module:
1) When users successfully upload their mp3's, they can click the 'Play' icon, but only hear 30-40 seconds of the audio before it stops. When they click the play icon again, the audio file restarts from the beginning and again won't play any longer than 30-40 seconds (I've tried it with many files, different sizes, etc).
2) After a user has uploaded an mp3 file, the file gets stored in the /audio folder not as Audio_File_Name.mp3, but as tmp, the next tmp_1, tmp_2, etc. Other users can click the link to download the files (useful for when it's not playing correctly, which it hasn't been)...but of course the filename they are offered to choice to save, run etc is 'tmp_x', instead of Audio_File_Name.mp3.
I had the audio module working perfectly on our old server, so I'm assuming there is some kind of IIS setting that is causing this wierdness. Has anyone ever encountered the above problems?