extension filename what is
Definition of Filename Extension for programmer: the point after the individual file name. Filename.

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Definition Filename Extension

Explanation: Filename extension is a portion of a filename, following the point after the individual file name. Filename extenson indicates the type of data stored in the file. Many operating systems use filename extensions, e.g. Unix,MS-DOS. Examples include "c" for C source code, "doc" for Miscrosft word, "ps" for PostScript, "txt" for text fle, etc.

Other definitions in programming such as Filename Extension in Dictionary F.