Archive named M5A97_EVO, a 406 KB RAR file consistent with the ASUS M5A97 EVO motherboard naming. Its contents are not described by the name, so check whether it holds a boardview, schematic or BIOS dump once unpacked. Boardview files of this size are common and open in viewers such as OpenBoardView or FlexBV, letting you trace rails and locate test points. If it turns out to be firmware, back up the existing flash chip before programming and confirm the image size fits the chip.
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.