Computer Basics: What is a Windows File Extension?
Follow along with James, as he explains file extensions
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**Things To Remember**
A file extension, or filename extension, indicates the type of file and what program will be used to open it
By default, file extensions are hidden. To unhide them, click on the Windows key, search “folder options.” Click on icon, click view, then uncheck “hide extensions for known file types"
Your computer uses file extensions to know which program to use to open a file
To see the list of file extensions and which program is associated with that file extension, type "default" into the Search Bo and click on "default apps"
If you try to open a file and there is no default program to open the file, the computer will give you an error message, asking you to download a program that can read the file that you are trying to open
Think of file formats or file extensions as a specific computer language that can only talk to programs that know how to speak that language. So music files can only be opened by music programs; the same with picture files, movies, and so on.
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