Have you tried using the .GI file that doesn't have any numbers beside it???
This is the file you should point Prassi at... It will automatically include the rest of the files.... If that doesn't work, you may have gotten a BAD image.....
OH... One other thing.... I HOPE you have the original game.. Since you said that you downloaded the image, you may want to consider re-wording your post, so no one will give you a hard time....(since talking about downloaded games is not allowed on the forum, UNLESS you own the original) Just a suggestion....