Small 84.8 KB RAR containing a Vietnamese PDF whose title translates to a mainboard not recognising the keyboard and mouse. Rather than a full board schematic, it appears to be a training or troubleshooting guide for that fault. Such guides usually explain the keyboard controller or EC, the PS/2 or USB lines, pull-up resistors and supply rails to check. Use it as general diagnostic help and compare the described circuit with the schematic of your own board, because component designations vary between makers.
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 @generalschematics. 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.