.net mvc - need to catch old requested downloadable file w/ new path

[fletchsod]

I'm moving everything over to new website, problem is full-file path for downloadable files from the old website does not exist in new website as they are put in different directory path.

So, how do I use the mvc route to catch the browser's requested file and redirect so the downloadable file will occur from the new directory path on the fly. (File type are executable file).

Thanks...