3DS Media Player
With next generation R4 3DS flash cards you can play Avi DivX, XviD, Mp3, Mkv, Mp4 and may more media container files on the Nintendo console without converting.
MP3 Music and Movie Player for Nintendo 3DS »
Compatible with Avi - DivX, XviD, 3D mkv, MP4, flv
CycloDS iEvolution review » finaly a flash card with full DSi Mode that can make ue of the camera, play DSiWare and access built-in SD card slot in NDSi and DSi XL.
Nintendo R4i SDHC N3DS Jailbreak with Real-Time Save