But what is about the protection system of the engine? I think if you change the icon of the Acknex application with something like "Resource Hacker" you won't be able to start the game.
Then you have to publish the whole game again! This protection system starts a self-test and if you manipulate some game files the game won't start up.
So that doesn't seem to be a good idea.

I don't think it checks the icon, but it might, and probably will now...

I wonder if using the bind instruction to include an ICO file would work. Either that or a bmap definition.

bind <mygameicon.ico>; // try this option
bmap mygameicon = <mygameicon.ico>; // or try this one

I have otherwise no idea how it can even be done....

From A6.40 on it's possible to change it, just look in the latest manual.

Cheers