I am trying to setup a download link for an MP4 video on my Website.

However, whenever I try to download it on a Mac with Safari browser it
just comes up as text not video.  If I rightclick and save the video
to the desktop it automatically appends .txt to the end of it.  I
understand this is because my webserver sends them as "text/plain",
which is why most browsers (all browser that behave correctly) will
treat it as text.

I found some information here: 
http://forums.applenova.com/showthread.php?s=f321258aade3082f44165cd86c29b956&p=244689#post244689

However, this doesn't work because if you right-click save as it tries
to download the php script not the video.  If you click it it tries to
play back in safari which doesn't support Mp4.

I will pay for a solution that will either allow me to be able to
right-click and download without .txt being appended to the end or to
be able to download directly into apples iTunes.

I need an answer very quickly so get your thinking caps on.

Thanks very much.