Server Download Complete... Event?

OK, It's driving me crazy and I'm hoping theres some one here who may hold the answer.

All I want to be able to do is be notified on the server when a client browser requests to download a file, and the file finshes downloading

E.G

Browser URL

http://www.Downloads.com/NewCabFile.cab

By default the users browser will request to save the file (or just download it), When the download completes I want the web server to then delete the file.

I have been looking at IHTTPModule and the EndRequest event,
But this does'nt appear to be any help?

Thanks in advance

Rich