RAR files of this nature are often password-protected. Common passwords usually involve the name of the site where the file was hosted. Technical Recommendation
Frequently found on file-sharing hubs like F95Zone, Kemono Party, or various "CG pack" aggregators. Content Analysis Milking_Farm_CG.rar
If you intend to view the contents, do so within a virtual machine or a "sandbox" environment to prevent potential scripts from executing on your primary OS. RAR files of this nature are often password-protected