type (format or extension) – indicates the content type of the file (e.g., .txt, .exe, .COM, etc.)
extension | South Extension | GNR Derbyshire and Staffordshire Extension | filename extension | Extension Gunners | Agricultural Research, Extension, and Education Reform Act of 1998 | 8.3 filename | Whitney extension theorem | Villeray–Saint-Michel–Parc-Extension | UCLA Extension Writers' Program | Shelf Life Extension Program | Park Extension | Optometric Extension Program | OpenGL Extension Wrangler Library | Map showing the biggest extension of Roman conquests in "Germania" during Augustus | La Salle Extension University | Java Cryptography Extension | Interstate 476 (Northeast Extension) | Horseheads 1855 Extension Historic District | Homestead Extension of Florida's Turnpike | Harvard Extension School | Gungahlin Drive Extension | Filename extension | Extension Scouting | Extension du domaine de la lutte | Alabama Cooperative Extension System | Agricultural extension |
Note that this file is actually an ASF file with a misnamed MP3 filename extension, of which in turn contains the audio recording in the MP3 format.
NES Sound Format (NSF or .nsf) is the filename extension of the audio file format originally designated as NESM (Nintendo Entertainment System Music) by the inventor Kevin Horton.
3GPP2 file format was designed for CDMA-based Phones and may have the filename extension .3g2
.m2ts, a filename extension used for the BDAV MPEG-2 Transport Stream, defined by Blu-ray Disc Association