Why does Firefox download .docx files as octet-stream?

When I try to open or download files that have the .docx extension FireFox 5.0.1 says they are octet-stream. Internet Explorer 8 opens and downloads the files correctly. Do I need to switch browsers or is there a easy "fix?"

As what kind of files does Firefox save the .docx files?
Firefox will always offer to save files that are send as application/octet-stream
See also:
*http://kb.mozillazine.org/File_types_and_download_actions
*https://support.mozilla.com/kb/Managing+file+types

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Why does Firefox download .docx files as octet-stream?

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