Part 2 of a larger split archive. You need all parts (e.g., part1, part2, part3) in the same folder to successfully extract the full ISO image.
These modified versions are popular because they often include modern enhancements not found in original 2011 discs: Windows 7 SP1 X64 Ultimate 3in1.part2.rar
Usually includes Internet Explorer 11 , .NET Framework 4.8, and DirectX runtimes. Part 2 of a larger split archive