GOM Player is a free multimedia player with popular video and audio codecs built-in. GOM Player supports file formats such as AVI, DAT, MPEG, DivX, XviD, WMV, ASF and more. Users don't have to install codecs separately.
GOM Player is capable of playing incomplete or damaged AVI files by skipping the damaged frames. It can also play locked or partially downloaded files.
It's other features include drag-and-drop support, HTTP streaming, editable skins, subtitling, overlay mixer, key remapping, enhanced filter rendering, real-time index rebuilding for AVI files and unicode support among others.
Key Features:
Built-in Codecs (DivX, XviD, etc.)
Plays broken files
Plays files that are locked or partially downloaded
Easy-to-use UI
FREE and adware / spyware-free | 
