: .rar is a compressed archive format. The part1 suffix indicates that the original software installer or data was too large for a single file and has been split into multiple pieces (e.g., part1, part2, etc.).
: If this file was obtained outside of official stores, be aware that the official version on Steam provides automatic updates, cloud saves, and community-made models. model-builder-v1-1-7-part1-rar
Model Builder is a digital hobby simulation that allows users to assemble, customize, and display virtual models. : and display virtual models. :