A file extension is a way of identifying what type of file a file found on your PC, tablet, or phone is. It's a way of helping you find the type of file you're looking for and what sort of program to open it with.
Understanding file extensions

A file extension is a way of identifying what type of file a file found on your PC, tablet, or phone is. It's a way of helping you find the type of file you're looking for and what sort of program to open it with.
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