An archive of repair files. Shared as “SIGMA S32DN7_LDD.M3663.A48_HV320WHB-N86.rar” — a .rar file, 4.62 MB.
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 @led_software. 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.
7-ZipWinRARThe Unarchiver (macOS)