force "save target as"?

[disgust]

is there any way to force a "save target as" dialog, if the file would normally be opened directly within the browser?

I realize I could zip/rar the file and offer that, and then it'd usually have the "save as" prompt, but that isn't really an option for the site I have in mind.

in particular I'm wondering about mp3s, but I'm curious about doing this in general for other file formats as well. if a user has certain plugs installed and I have an mp3 link open up, it'll play inside the browser with that said plugin, when I'd really like the user to download it, not stream it.

moderately related tangent: anyone know what percentage of users have quicktime installed, roughly?

[moltar]

You can force a different content type:

application/octet-stream