Antonyms for file name extensionfile name ex·ten·sion

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1. • String

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1. extension, filename extension, file name extensionnoun

   a string of characters beginning with a period and followed by one or more letters; the optional second part of a PC computer filename

   "most applications provide extensions for the files they create"; "most BASIC files use the filename extension .BAS"

   Synonyms:
   lengthiness, prolongation, filename extension, extension, extension phone, university extension, annex, telephone extension, elongation, denotation, propagation, wing, extension service, annexe, reference

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