Found this and thought it was interesting. Claiming to be almost every file format in existence in one list. Including now unused formats and current. I would have no idea if the list is complete but I reckon that it might go close.
So if you have ever wondered if a file format exists or ever has; this is a great place to start. Alphabetical order for easy searching.
Almost Every file format in the world!
Rooster's Rail 
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