You cannot extract just Part 1. You must download all subsequent parts (Part 2, Part 3, etc.) and keep them in the same folder.
Because this game was delisted from official stores, files found under this naming convention often come from third-party "crack" or "repack" sites.
Large games (this one is roughly 25–35GB) are often split into smaller chunks (like 5GB each) to make them easier to upload and download.