Rewrite, but only if directly accessed?

[JosieNutter]

I am a total mod_rewrite newbie, and I'm trying to figure out how to do something ... IF it CAN be done.

Let's say I have a file.

An embedded plugin calls this file by name.

Since there is no real way to disable viewing source, I want to use a "decoy" filename. Something that doesn't really exist.

If the plugin requests it, I want it to give it the real one, but if someone tries to go to the URL directly, they get nothing.

Is this possible?