Archive labelled for the P8H61-M LX2 motherboard, a micro-ATX board on the Intel H61 chipset, with no revision or content type given in the name. At 338 KB it is likely a compressed BIOS image or a small set of service documents, so extract and identify the files first. Before writing any firmware to the SPI flash, record the board revision printed near the slots, read and save the existing chip contents, and make sure the image length matches the chip size to avoid a failed write.
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.