| File Types With Varying Extensions A file extension is the three letters of a file name after the dot. It is created by the application when you save a file. It is the way operation systems identify which application to use to open a file. Windows often doesn't list them when you are searching for a file, but they are there. Examples are: .txt, .doc, .exe, .html, .jpg, .gif, .wav. However, sometimes you will want to save a file with different extensions. In order to do that, select Save As in the File menu. The Save As box will open. Choose from the drop-down menu next to Save As Type the type you want to save. The extension of the type will be created for you by the application. Here is an example from Microsoft Word:
Some file extensions:
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