htaccess redirection

[BK87]

I'm stuck. I'm trying to add a "counter" system for downloads, say the url is "http://www.domain.com/file.exe" .

 

Now what I need is htaccess to pick up the url and run a php script, and after php is ran go back to actual file and start downloading.

 

The way I have it now, is htaccess picks up the url, runs the php script and reads the file with php as octec-stream.  I don't want php reading files each time a user downloads one.

 

Any one have any suggestions?