Thread:Project:Support desk/Trying to upload a doc file gives error: "Cannot upload this file because Internet Explorer would detect it as "application/msword", which is a disallowed and potentially dangerous file type."/reply (2)

Just as a note, MS word documents can be dangerous to upload due to the faking-it-as-a-java-applet vulnerability (could allow someone to do evil things to your wiki), which is why they're on the blacklist. In 1.18 we started scanning such files for such issues better, so as of 1.18 MS word files are no longer blacklisted.