Missing .fx file:

Help!
I was working on a route and the sim crashed. When I tried to restart, nothing happened. Just a black screen. Got a message box that says the program couldn't find "TrainBasicObjectDefuse.fx" , along with a message "File.Dxcommon\cHcEffectMaterialDx.cpp" Lin 1181.
I've re-downloaded steam (a couple of times) & still no joy. I've looked for an answer on this forum and google but haven't been able to get an fix. Where can I get these files and how do I get them loaded?
Thanks,
Dave
I was working on a route and the sim crashed. When I tried to restart, nothing happened. Just a black screen. Got a message box that says the program couldn't find "TrainBasicObjectDefuse.fx" , along with a message "File.Dxcommon\cHcEffectMaterialDx.cpp" Lin 1181.
I've re-downloaded steam (a couple of times) & still no joy. I've looked for an answer on this forum and google but haven't been able to get an fix. Where can I get these files and how do I get them loaded?
Thanks,
Dave