: Because the full installation requires approximately 6.0 GB of disk space, it is often split into multiple "parts" (e.g., .part1.rar , .part2.rar ) to facilitate easier downloading.

The file is the first volume of a multi-part compressed archive containing the 64-bit installation media for Autodesk's AutoCAD 2016 software. Key File Characteristics

: You must have all subsequent parts (part2, part3, etc.) in the same folder to successfully extract the contents. WinRAR or a similar utility is typically used to reassemble them into a single installer.