Select "7-Zip" -> "Extract Here" or "Extract to [Folder Name]".
While 7-Zip is standard, WinRAR can also handle split .7z files.
Once extracted, you will likely have an .exe file or a set of game files to run the game.
7-Zip will automatically recognize parts .002 through .012 and combine them during the extraction process.
It is highly recommended to use 7-Zip to handle this archive. Extract the First Part: Right-click COM3D2_EN.7z.001 .