Hi all,I tried to install the FS9.1 patch and it stopped and showed : atc.dll module invalid or modified. Is it related to RCV3?I have also My Traffic installed,Thanks for the help,

No sorry it is not related to RC. I've installed the patch on my laptop and desktop without problem. Check your other add-ons. One of them must be the culprit.

Hi,yeah me too (installed the FS update on my laptop and my desktop pc and had zero problems).janosch

>Hi all,>I tried to install the FS9.1 patch and it stopped and showed :>atc.dll module invalid or modified. Is it related to RCV3?>I have also My Traffic installed,>Thanks for the help,>Go to this site and it should explain why you are getting the atc.dllhttp://www.microsoft.com/games/flightsimulator/downloads.aspYou have to use the files and Fs. Exe which come with the program.Kenny G.>

Hi Herve,To echo Kenny's post: Your atc.dll file (located in the MODULES folder) is an FS9 file. You must pull it off of your original installation disks and overwrite the one in your MODULES folder, then try running the patch again. I had the same problem with panels.dll; I pulled the file off the original disks, tried the patch again (which installed w/no probs), and now have it working with no problems.Hope it Helps!Cheers,Mike T.

It doesn't fit in the radar contact forum, but I have the same problem and this is the first time I read about this special 'atc.dll' problem.Fact is, I extracted the original file from the FS2004 installation CD, but that didn't help !Always the same problem: " 'atc.dll' is missing or has been modified", and the patch stops processing.Any other ideas ?Matthias Huck, Germany