Hey guys, im probably going to look stupid here, I've looked everywhere and no-ones complained about the problem im having lmao, how dumb am i lol,

Anywho, ive made a backdrop scene for something im doing and i want to render the backdrop animation with mental ray, as it the most realistic render engine for my scene, however, when i go to render settings, the (*.AVI) ext is not there with mental ray?... so im lost.. do i render the images seperatly and join them later or something?i really am lost..

here is a pic of the scene i've made, its pretty basic, i need to ask for some advice with my sdk setup aswell but i'll leave that for another time. in the animation the floor retracts over a pit and has fold out panels inside that fill in the gaps between each floor board.