| filename extension The portion of a filename, following the final point, which indicates the kind of data stored in the file. Many use filename extensions, e.g. , , . They are usually from one to three letters (some sad old OSes support no more than three). Examples include "c" for , "ps" for , "txt" for arbitrary text. Compare: . {Tony Warr's comprehensive list (http://camalott.com/~rebma/filex.html)}. {FAQS.org Graphics formats (http://www.faqs.org/faqs/graphics/fileformats-faq/)}. (2000-08-02) |