If you run Desktop Manager and go into Application Loader and click on Update Software (making sure 126.96.36.199 is the only OS installed on the PC) it MIGHT detect it, since it is included with the OS. It will usually detect missing files that it previously installed.
Edit: If that doesn't work, exit DM and keep the BB plugged in. Go to the following URL (on your PC):
and click on download. Pick your language on the following page and click on Next. Internet Explorer should ask you if it is okay to run an ActiveX control for loading ALX files (AxLoader Module). Allow it to. It should connect to the device over USB and load the .COD; I don't guarantee it will work but it is worth a shot.