No way to upload my design document. I have zipped it with both 7zip (as zip archive) and windows "send to compressed folder", rar-ed with rar.exe and tar.gz-ed. These are the MIME types reported:

Reported MIME type - application/x-zip
Reported MIME type - application/gzip
Reported MIME type - application/rar


EDIT: Dunno why, but I have tried with IE instead of ffox and it worked.