You will need the Marathon Recompiled tool to create the PC port from your own legally acquired Xbox 360 files.
For specific installation steps and downloading necessary files, refer to the Mastering Sonic P06 Beginner's Setup Guide . To make sure you get the right files, The Marathon Recompiler tools to build it yourself? Specific stages from the game? Let me know which you need, and I can guide you further. Mastering Sonic P06 | Beginner's Setup Guide P06.7z
Project '06 (P-06) is a fangame created by chaosX that rebuilds the original game, but it does not include game assets. You will need the Marathon Recompiled tool to