: X64 indicates it is built for 64-bit Windows operating systems.
The filename typically refers to a compressed archive segment of Siemens NX 1847 Series (specifically version 1851), a high-end CAD/CAM/CAE software suite. File Details Software : Siemens NX (formerly Unigraphics). 18.1.3.0008.X64.part1.rar
This specific build was a monthly update for the NX 1847 series. Users typically download these files to update their existing installation to improve stability or access minor feature enhancements. : X64 indicates it is built for 64-bit
: .part1.rar means this is the first volume of a multi-part split archive. You will need all subsequent parts (part2, part3, etc.) in the same folder to successfully extract the contents. This specific build was a monthly update for
: 18.1.3.0008 corresponds to the NX 1851 release, which was part of the first "Continuous Release" cycle introduced by Siemens.