OpenWith.org Desktop Tool 1.0.1 is software you can install on your PC and use to find a legitimate recommendation for unknown file extensions. Simply highlight a file which isn't associated with an application, go to your right-mouse button menu and select the option to check with OpenWith.org. This will check the OpenWith.org website and look at the recommended software for the file extension. However, some of the software it recommends isn't always free, even though it states it is free.
OpenWith.org Desktop Tool link.
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