Twinmotion is a high-quality real-time 3D immersion software developed by Epic Games . It is used primarily by architects and designers to create stills, panoramas, and standard or 360° VR videos from BIM or CAD models. Understanding ".rar" Multipart Files

: You need a tool like WinRAR or 7-Zip to extract them.

When you see "part1.rar," it indicates a large software package has been split into smaller chunks.