ASUS A88XM-E motherboard archive in RAR format, 201 KB. The board is an AMD A88X micro-ATX design for FM2+ processors. The file name gives no hint of the contents. Given the small size, a boardview or a compact schematic is the likely payload. Technicians use it to identify parts by designator, trace the APU power stage and locate test points during no-boot diagnosis. Extract with WinRAR or 7-Zip, and verify that the PCB revision matches.
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)