A 483 KB RAR file covering the ASUS A88XM-PLUS, a micro-ATX motherboard with the AMD A88X chipset for FM2+ APUs. The name does not specify the contents, so inspect the archive after extracting it. Repair packages of this kind typically provide boardview or schematic data for tracing VRM rails, checking the memory supply and finding the SPI flash. Compare the PCB revision silkscreen with the document before using it to judge component values or positions.
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 @boardview. 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)