We generally want to examine the contents of files because they contain some useful information, and storing, viewing, processing, and manipulating that information is our reason for using a computer at all. The problem is that there are many different types of files, and different ways of opening them.
In the world of Windows, the filename extension (.doc, .txt, and so on) is traditionally how the system knows what type of file it is dealing with. How the file is displayed in the Windows Explorer file manager and what application will open it is decided by the file extension.
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