Unable to set "always open with" checkbox
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                bas
            
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        Published on 2013-11-10T20:09:59Z
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            2013/11/10
            22:03 UTC
        
        
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Configuration:
- windows 8 (desktop)
- firefox (latest version)
I've been trying to figure out how to enable the checkbox to "always open with ... application for file type", for quite a while without any luck.

Can anybody explain to me how I can enable the checkbox (see red rectangle). It's in Dutch, but I hope you recognize the dialog.
Tried so far: - default programs (control panel) - HKCU/Microsoft/.../FileExts: remove the UserChoice (but it was already removed, so no luck there either)
Thanks a lot in advance
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