The number of video formats supported by the KDL-55W800 is more than most similar spec TVs that came out around the same time as it. The most commonly supported video format is AVI, but this video format is not supported by this TV. The video formats AVI|MKV|MP4|MPEG1|MPEG2 are also supported by this Sony TV.
AVI stands for Audio Video Interleave.
MP4 stands for Moving Pictures Expert Group 4.