Gom Player
Developer: GOM Lab
Class: Media Player / Video Convertor
OS: Microsoft Windows 98SE, Me, 2000, XP, 2003, Vista or Windows 7
Description:
It has in-built Codec Finder.
GOM Media Player comes equipped with all of the most popular video codecs (XviD, DivX, FLV1, OGG, MP4, H263 and more) by default, so downloading and installing extras is rarely necessary. For those videos that do require a separate codec, GOM Media Player will find one and direct you to a place where you can download an open source version. That way, you won't get stuck with unnecessary codecs on your system.