FOURCC.org - Video Codecs and Pixel Formats

fourcc: DX50

DivX MPEG-4 (DX50) info

Homepage: DivX MPEG-4

Owner: DivX

Apparently this is used interchangeably with the DIVX FOURCC when using version 5 of the codec. An alternative download site can be found here.

DivX MPEG-4 downloads