A 206 KB RAR archive for the ASUS A85XM-A, a micro-ATX board based on the AMD A85X chipset for FM2 socket APUs. The contents are not described in the name, so unpack it to see whether boardview or schematic files are present. These help trace standby and core rails, locate the SPI BIOS chip and find shorted capacitors. Check that the revision silkscreened on the motherboard matches the files before trusting component placement.
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)