I don't see much need to use gm8.1 for Xtreme3D, but the installation is exactly the same as for gm8, put all DLL files in your project folder (.gm81), and open the EmptyProject.gmres file to create a new project.
EmptyProject.gmres
EmptyProject.gmres
Программист,Художник
музыкальный продюсер (FIRERUN): https://soundcloud.com/djfirerun
Xtreme3D Editor (Xtreme3D с графическим интерфейсом): https://vk.com/x3deditor
музыкальный продюсер (FIRERUN): https://soundcloud.com/djfirerun
Xtreme3D Editor (Xtreme3D с графическим интерфейсом): https://vk.com/x3deditor