The "part01" designation indicates this is part of a larger set. You will need to download all subsequent parts (part02, part03, etc.) and keep them in the same folder to extract the full game successfully.
The file is the first part of a compressed archive containing the game Watch Dogs , likely distributed by the Indonesian site IndoriGamer . download-watch-dogs-indorigamer-part01-rar
Use a tool like VirusTotal to check the file. The "part01" designation indicates this is part of