An archive of repair files for MSI hardware. Shared as “Prodesk 400 G3 SFF (00.02.07) MS-7A02 v1.0.rar” — a .rar file, 4.55 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 @Satale_bios_esquemas_Laptop. 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)