It's me again fiddling around with my hacked SMBX.exe.
This time I changed that message at the end of the credits of SMBX:
Yes I know - it dosn't make any sense whatsoever, but the original message from before did the exact same to me anyways. xD
But not only this, I also finally found out where to change the version number and title on the window-header.
What I also could change is that SMBX now takes snapshots as png instead of bmp.
When the .exe is done, it will be called "Version 1.3X" since it is no "official" version.