Reset File Association
Its common nowadays where one has mistakenly associated a file to the wrong program/software or just wanted to open a specific file but ...
http://stereodive.blogspot.com/2014/02/reset-file-association.html

Its common nowadays where one has mistakenly associated a file to the wrong program/software or just wanted to open a specific file but not entirely wanting it to be associated with the program/software. After the file is associated with the program, you want to restore it back to default but can't seem to fix with setting the default association to default in windows. The next thing you'd probably do is find a way to revert it back, though some trick require you to edit and modify the registry, it is risky and may result in a damage system settings or even make your computer unbootable. After spending some time searching the web, i found a program that will restore the file to its default association. This tiny program does the job with flying colors, no need to take the risk of damaging your system doing those registry tricks. FileTypesMan is an alternative to the 'File Types' tab in the 'Folder Options' of Windows. It displays the list of all file extensions and types registered on your computer. For each file type, the following information is displayed: Type Name, Description, MIME Type, Perceived Type, Flags, Browser Flags, and more. FileTypesMan also allows you to easily edit the properties and flags of each file type, as well as it allows you to add, edit, and remove actions in a file type. You can download FileTypesMan for free.