Probably was included with the Gigabyte motherboard software ?
When you reinstalled Windows 10 fresh, did you use Gigabytes CD to reinstall all the Motherboard's drivers? Your motherboard seems to come in both Intel and AMD versions. It is possible the the CD may include drivers for both Intel and AMD motherboards and you may have installed XTU by accident. Otherwise there is no mention of XTU in the Gigabyte's Website concerning your AMD motherboard. The only Intel chip your motherboard uses is a Intel LAN chip which XTU is useless for.
It is a mystery because XTU is used only on Intel Motherboards or Processors. On a AMD motherboard it would be useless. Unless an a driver in your motherboard somehow uses the XTU service and installed it.
no i never use the CD and anyway I don't have an optical drive on my machine, i always download from AMD, the gigabyte cd i throw into the trash can.