The Philips 55PFS6609 has a greater number of video formats than most TVs of a comparable age and spec to it. The most commonly supported video format is MPEG1, but this video format is not supported by this television. The video formats AVC|AVI|H.264|MKV|MPEG1|MPEG4|WMV9 are also supported by this Philips television.
AVI stands for Audio Video Interleave.
WMV stands for Windows Media Video.