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Definition of Filetype
1. Noun. (computing) An identifier for the type of information contained in an electronic format. ¹
2. Noun. (computing) A command in certain operating systems that creates a directory of files of a particular type or sorted by type, or that limits the results of a directory search to a particular type. ¹
3. Verb. To assign a type to a file. ¹
¹ Source: wiktionary.com