You could pack it in a document/presentation that allows fullscreen-viewing if the Active x controls allow.
You could use a webpage: make a htm / hta file that spawns a full screen 'child'. That'd leave you with two open instances of the browser, so you could maybe have the fullscreen window close it's 'parent' while you're at it.
I'm not aware of a way to make the flash executable packages do it, but that'd be simpler and much more cool.
Quicktime plays Flash files, have you tried that? Hit Ctrl + 3