RAR archive of 240 KB for the ASUS F1A55-V PLUS, an AMD A55 chipset motherboard for FM1 processors. The name does not describe the contents, which likely include a BIOS image. Open it with 7-Zip or WinRAR and look for readme or version details. Before writing anything to the SPI flash with a hardware programmer, read and store the original chip contents. Make sure the board really is the V PLUS variant, as F1A55 models differ in layout and firmware.
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)