I just upgraded to WIN XP from a clean install. I moved all my fs stuff over after reinstalling fs2002. So now for the problem, all my addons work all my A/C work except for one. I get a 3rd party software error and it points to the model folder and the .mdl file.I'm not sure if I used this A/C after installing WIN XP I think I did but maybe not. This is an older DC-9 maybe FS98 vintage but I have many other A/C as old that do work. Hummmmm so if anyone has an idea of how to fix this that would be great. Funny how after this one stops working whats on the front page of Avsim, VANs DC-9s for FS2002, they look great but do not have a Midwest Express DC-9-32.Thanks in advance!

download and install mdlrepair201.zip

That did it. Thanks so much.