Filename Extensions, including: Ogg, Php, Pcx, Filename Extension, Deb (file Format), Com File, Djvu, .dwg, Rmvb, Vob, Bup, Ifo, M3u, .chm, Qcow, War ... .properties, .cso, Md3 (file Format), .db

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More info: A filename extension is a suffix to the name of a computer file applied to indicate the encoding convention (file format) of its contents.