Transfering blender anim, to AVI

I am trying to put an animation i made on a website I have, however when i save as runtime I can’t open the file, I have changed the file format to all 3 AVI options but I still can not open them outside of blender.

If you render an animation, the AVI file is stored automatically. Save runtime has nothing to do with it. You’ll find your AVI file in the location specified by the first line in the Output panel left of the Render buttons.