A filename extension can tell you valuable information, such as the file format.

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A filename extension is a suffix added to the end of a filename that indicates the type of file and the program it is associated with. For example, a file named "example.docx" has a ".docx" extension, which indicates that it is a Microsoft Word document. Knowing the extension can help you determine which program can open the file and what type of content is in the file.

A Filename Extension Can Tell You Valuable Information, Such as the File