If you have downloaded part03.rar , you cannot open or run it by itself. Multi-part archives act as a single giant folder split into smaller pieces. You need all of them present to unlock the game. 1. Download All Parts
Once the extraction is 100% complete, open the newly created game folder. Harem_Hotel-v0.16.2-pc.part03.rar
Download and install a free extraction tool like WinRAR or 7-Zip . If you have downloaded part03