Files with this naming convention are frequently shared on third-party forums or file-hosting sites. If you didn't get this directly from an official developer channel (like their Steam page or official crowdfunding site):
: Use a tool like VirusTotal before running any .exe files extracted from the archive. 171_pr__alpha_.part2.rar
: Unofficial .rar files from random links can contain malware. Files with this naming convention are frequently shared
The file is the second part of a multi-volume compressed archive for an early alpha version of the game 171 . 171_pr__alpha_.part2.rar