Has anybody yet found a way to replace the runtime icos without the shortcut -f .blend way in 2.42? None of the posted Dev tools nor XNR Editor seem to work. Extensive searching hasn’t turned up any working correction. As much as I love the Blender Fish, it just doesn’t seem professional to release a game with it as the ico 
Resource Hacker, and its successor XN Resource Editor both seem to corrupt the exe somehow. Running the usage -f .blend works fine, but requires the user to either use a shortcut built by them, or the command line entered by them.
Ahha, my mistake, I was installing the ico’s in the icon directories instead of the icon groups.