Unwanted Firefox entry in the Open With Windows Explorer menu

Open Windows Explorer and right-click various file types. You'll see there's a submenu called "Open with" that allows you to choose a particular application. Firefox is listed for numerous file types it can't actually handle, like RAR and MKV.
Does anyone know why? I've never attempted to open those file types with Firefox, though I did download such files with Firefox. I can't find any bug reports about this, and the above seems like too little information to file a report.
I'm not the only one with this issue:
* http://forums.mozillazine.org/viewtopic.php?f=38&t=2870531

After cleaning the registry manually, I haven't been able to trigger this.
* I now have RAR under Options → Applications again after downloading a file of that type. The respective file type doesn't have Firefox under the "Open with" menu in Windows Explorer.
* I set Firefox as the default browser when installing. Then I set Internet Explorer as the default using the Control Panel, then Firefox again when prompted at startup. Since it's one of the few times Firefox interacts with the registry, I thought it might trigger the issue — it didn't.
Since I can't recreate this, I think we can consider it a rare occurrence and forget about it. Thank you all for replying.
''the-edmeister wrote:''
There's something screwed up in Firefox 31 and 32 with regards to Firefox messing with Windows OS File Associations […]
Being Sunday, I'm too lazy to search for the relevant Bug report.
* [https://bugzilla.mozilla.org/show_bug.cgi?id=1049521 Bug 1049521] - Be less aggressive about non-primary file type associations in Firefox on Windows
That's the bug report about Firefox inadvertently stealing the file association for PDFs. That didn't happen on my system. I also don't see how this could be related. The PDF association is set on install, and reinstalling Firefox didn't change the "Open with" list for the previously affected file types.
Then again, the patch on bug 1049521 touches the ''OpenWithList'' registry keys, which is what I manually cleaned up. It also handles more than PDFs: I spotted media file types like OG? and WEBM, but not MKV or any of the previously affected file types on my system.
''FredMcD wrote:''
Me thinks me smells a virus at work.
The system is clean.

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Unwanted Firefox entry in the Open With Windows Explorer menu

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