XcomUtil is a game enhancer. It is not really an editor and it is certainly not a cheat program. The original purpose of XcomUtil was to make the game more difficult, because there was a bug in the original game that forced all games to the Beginner difficulty level, regardless of what level you chose.
Today, XcomUtil not only fixes the Difficulty Bug and several others, but it enables you to use all five ships to carry troops, it can randomly redesign the alien ships before each battle, and it can allow you to pick your terrain and the type of alien ship before each battle. The image below is an OS/2 screen capture of the new XCOM Interceptor. It holds up to 6 soldiers, with the possibility of one tank.