i took some videos using my digital camera at a concert a few weeks ago and would like to compile them all together to form 1 big video using iMovie. my memory card was full so i had to upload the videos to a friends computer (i was on vacation) and he put the videos on a cd for me to take back home with me. all the movies on the cd are .mpg files. is this normal? because when i try to drag the files into the box on iMovie it says it doesn't recongize the file type. this is my first time ever trying to do something like this, so i have no idea what needs to be done. please help!