A filename extension is the set of characters at the end of a filename that allows computer software and users to quickly determine the type of data stored in the file. It is one of several popular methods for distinguishing between file formats.
Understanding the file extension type means that users can identify unknown files and assign an appropriate program to open them. As there are hundreds and thousands of filename extensions, it would be almost impossible to memorise them all, so we've put together an exhaustive A-Z guide of file extensions for every type of file you might come across.
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