In a session I tried to play an MP4 video file after import to td6.8 but it would not play and I had to convert it to a .wmv file format or a mpg file format for it to work in TD6. In td360 mp4 files will play ok. TO convert a file from mp4 to wmv you can use MOVIE MAKER from Microsoft or use a program like Adobe Premiere Elements or other conversion software.