thanks for the reply!!
I have try with .avi, .flv, .mp4, and .mpg

the windows media player plays all of it formats

I have windows 7 64bits home premium and Directx 11
I have tested with the the last version of A7 commercial, and with the free version of a8...

Someone that has windows 7 64bits can test if 3dgs open this formats?...