Media Player Codec Pack / Plus

It supports almost every compression and file type modern video and audio files use. The package includes video codecs and filters, such as ffdshow, LAV, XviD Encoder, Flash FLV, audio codecs, and filters (AC3Filter, LAV Audio, etc. DivX Audio, and Lame MP3), plus a collection of other source splitters and filters. The installer lets you pick the components you wish to deploy on your computer.