Open source graphics/audio game engine?

[N64Mario]

Is it possible to make a game where material (sprites, music/audio,) is open source by the creator? I mean, if a games MMF source code (.mfa) is closed, is an application.exe only, but the creator leaves open all sprite sheets, sound open so other people can switch the sprites to their own characters?

In other words, the MMF application would be able to load sprites of the player, enemies, items, & audio outside the .MFA file.

[LB]

You can use an expresion for sound files so it has to load it from a file, and the alpha channel and picture object [maybe even sprite sheet object] can load from pictures at runtime and thus be animated, and can have a movement and such. You can even set the hot spot on the alpha channel object. Also, it's tricky to do, but you can check "include external files" in the application's properties and it will load them from files, I think.

[Novabrain]

The Active Object allows you to load graphics/animations as well.

It is a little more tricky in its current incarnation than doing it in the editor, but if you work with it, it should be able to accommodate your needs concerning sprites.