Extract Myst_v1.8.3-Razor1911.part1.rar using WinRAR or 7-Zip (the other parts will extract automatically). Mount or burn the resulting ISO if applicable. Run setup.exe and install.
Download all parts (Part 1, Part 2, etc.) into the same folder. Myst_v1.8.3-Razor1911.part1.rar
This filename refers to a release of the game , specifically version 1.8.3 , cracked and packaged by the scene group Razor1911 . Extract Myst_v1