Do you think you could update this for GTA IV Complete Edition? I've got to take the d3d9.dll out, or it crashes on startup, but when I do take it out, I get a black screen in-game, although I can see the hud.
If you put custom license plates on the template, then you'll want it to be a bigger size, or the license plates will be terrible quality. But you're right, it is optional.
All you have to do is make a 4000x4000 template on Paint.net, then make the background transparent. Re-name it to the sign in the .ytd, then boom. Transparent.