Quote: "do you animate the sprites by making a function of the fliping through the image numbers"
Yes that would be one way of doing it, Don't use AVI for that. AVI is basically a movie that you can load into darkbasic. It doesn't have the same propeties of a sprite e.g. you can't check for collision. I use AVI at the start of my games as an introduction.
As for the 'Non darkbasic file', I have one idea as to how it happened. Once, I made a version of a game and called it "whatever v1.2". Darkbasic saw the '.' and asumed I wanted to save it as a '.2' file extension. So all the data was saved, but not as a darkbasic file ('.dba' file extension).
Does that make sence to you?

Nothing is impossible...