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Chapter 6. Programs and Documents > Filename Extensions

6.9. Filename Extensions

Every operating system needs a mechanism to associate documents with the applications that created them. When you double-click a Microsoft Word document icon, for example, Word launches and opens the document.

In Windows, every document comes complete with a normally invisible filename extension (or just file extension)—a period followed by a suffix that's usually three letters long. Here are some common examples:


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