Middle volume, number three of five, from a RAR set containing Windows 10 Pro in a multi-language, pre-activated repack, 1.00 GB in size. It holds only a slice of the data and cannot be unpacked separately; the chain begins with part1.exe and ends with the smaller part5. Missing or corrupt volumes stop extraction, so check every piece. Because the build is an unofficial modified release, treat it with caution, scan it and use licensed Microsoft media for client systems.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @laptopschematics. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.