We see them every day at the end of our document names, normally 3 letters (but doesn't have to be 3) that are added to files after we create them. But why are they there? Files extensions are a very important part of a file. Their main purpose is to tell your computer what program or application to use when opening that file. Without the extension your computer would not know how to open your files.
Have you ever gotten a message asking what program you want to open a file in? If you get that then most likely your computer does not have the application associated with that files extension. If you every need to know what program a file extension is associated with here is a link to an alphabetical list of file extension (I know this is a Wikipedia link but trust me it is correct): Extension List
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