File Extensions Explained

Although perhaps a bit on the arcane side of things, working with electronic files can be made a bit more understandable if you know what their file extension is and what the (usually) three letter abbreviation after the "." at the end of the file name means. For example, the extension on this file name ("profoundutterance.doc") is ".doc" (in all cases leaving out the quote marks). It's pretty easy to guess that .doc might be an abbreviation for "document" which would suggest probably word processing which might lead you to guess .doc indicates a Word document. And, indeed, it does.

Another example is ".pdf". That combo doesn't really look like a clue for any pronounceable word. Some file extensions take the first letter from it's name and that's the case here. .pdf comes from "portable document format".

In case you don't know, there are many, many, many file extensions, some more obvious than others. Knowing how to translate an unfamiliar file extension can immediately tell you, for example, if you have the necessary software to access that file. The file extension can also immediately tell you what type of electronic information you're working with....word processing, presentation, image, audio, video, and so on.

Instead of looking for lists of file extensions to memorize, you should consider going to a site like FILExt -- The File Extension Source. It's fascinating in many ways, not the least of which is that some file extensions have multiple applications.