Ensure you have downloaded COM3D2_EN.7z.001 through COM3D2_EN.7z.012 (or whatever the final number is) and placed them together in a single folder.
The file COM3D2_EN.7z.012 is a part of a for the game Custom Order Maid 3D2 (specifically a translated or English-modded version). Because this is a .7z file split into multiple parts ( .001 , .002 , ..., .012 ), you cannot extract just one file. You must have all parts in the same folder to extract them properly. How to Use/Extract COM3D2_EN.7z.012 File: COM3D2_EN.7z.012 ...
It is highly recommended to use 7-Zip to handle this archive. Extract the First Part: Right-click COM3D2_EN.7z.001 . Ensure you have downloaded COM3D2_EN
If you are having trouble with the extraction, please tell me: What are you getting? Are you using 7-Zip ? If it's about the game itself, How to Easily Open 7z Files on Windows You must have all parts in the same
7-Zip will automatically recognize parts .002 through .012 and combine them during the extraction process.
If one part didn't download completely, you will get an error. You may need to redownload the specific part mentioned in the error message. Missing Part: All 12+ parts must be present.
While 7-Zip is standard, WinRAR can also handle split .7z files.