An archive of repair files for HP hardware (board 6050A2636101). Shared as “HP t620 Flexible Thin Client (L40) 6050a2636101-mb-A02.rar” — a .rar file, 1.99 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)