I WANT TO ADD MORE PICTURES AND EDIT A .WIMP FILE BUT WHEN I TRY TO LOAD IT IN MOVIE MAKER I GET A SMALL WINDOW WITH THE MESSAGE "CAN'T USE THIS TYPE OF FILE, YET IT CLEARLY SAYS, IN THE LIST OF ACCEPTABLE FILES, THAT .WIMP FILES ARE AMONG THE ACCEPTABLE ONES, AS ONE WOULD EXPECT, SINCE THEY WERE CREATED BY MOVIE MAKER.. WHAT AM I DOING WRONG?