Unfortunately "pz3, cr2, pp2" and the other file formats that describe exactly what they are, are likely copyrighted too. If someone was use any of those, the same thing could happen. You can't trademark or copyright a file extension. If it were possible, then thousands of file extensions would be in trouble and there would be a global class-action suit against the idiot company that tried to enforce such a preposterous notion. If you do a search on ""file extension" trademark", all you get are links about file extensions and 'this product is trademarked'. Meaning, they can trademark a product's name or other names associated with the product (a named feature, for instance0, but not its content. They can copyright the content format but not names associated with it, unless it is a uniquely trademarkable feature. Can Curious Labs really infringe on my ability to use "pz3" for my "Pizza 3.0" program? Let 'em try! ;0)

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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