The LG 26LN450 has a greater number of video formats than most TVs of a similar age and spec to it. The most frequently supported video format is MPEG4, but this video format is not supported by this TV. The video formats DIVX and MPEG are also supported by this television.
MP4 stands for Moving Pictures Expert Group 4.
WMV stands for Windows Media Video.
AVI stands for Audio Video Interleave.