file extension definition, meaning - what is file extension in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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English definition of “file extension”

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file extension

noun [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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