Opening volume of a four-part set carrying a single-language Windows 10 Pro image marketed as pre-activated; at 1.00 GB it is a self-extracting RAR executable rather than an installer. Running it, or opening it in WinRAR, rebuilds the full image only when parts two to four are in the same folder. Repair shops use such media to load a test OS on a fixed machine, but this is an unofficial modified build, so scan it with antivirus and prefer genuine Microsoft media for customer installs.
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.