File Name Extensions

A set of characters at the end of the file name which describes the type of information which the file has is called File extension. A file name extension can also indicate which application is associated with the file. For instance, my file is mypicture.jpg. Here jpg is the file extension, which describes that this file is a paint document. Likewise if my file name is mydocuments.doc than then .doc is a Microsoft word document.

 

While accessing a fine in Microsoft windows xp, it compares the file name extension to the already installed applications to launch a appropriate application for displaying the file. This process of comparing an extension to an application is called file association. It determines which application will open the file by default.

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