Sadly there is no user interface or control panel to do this.
It's technical so let's use this prior discussion.
http://superuser.com/questions/49615/how-do-you-remove-a-default-program-association-for-file-types-in-windows-7
Win 7. I used to be given a choice like winrar or vlc etc when I clicked to download a movie or zip file. Now I do not,it always automatically picks winrar. How do I regain the right to choose instead of always using winrar?? There used to be the option to open or save,someone here chose something and I need it back like original Thank you

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