Change file sharing settings

I have a site which offers multimedia in the form of Quicktime movies, such as:
the problem is, my users have to right click on the download link and save the target in order to download the file. Otherwise, it starts to download in the browser and the Quicktime icon shows on the page.
Is there a way to change settings so that clicking on the download link brings up the download box (standard dl dialogue) that asks you what you want to do with the file, like on most websites?

Check the wiki for htaccess and find the example for downloading a text file.

My website