file extension Meaning in Cambridge English Dictionary
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Meaning of "file extension" - English Dictionary

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file extensionnoun [C]

uk   us  
a dot followed by three letters, such as .doc or .jpg, that forms the end of the name of a computer document: Be sure to type in the document name and file extension before you click "save".
(Definition of file extension from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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