Rar archive for the base P8H61-M motherboard, an Intel H61 chipset micro-ATX board, with no revision or content type given in the name. Extract it to find out whether it contains a BIOS image, a schematic or boardview data. Since several LE, LX and PLUS variants share this name root, verify the exact model and revision on the PCB before use, and when flashing, back up the original SPI chip first and check that the dump size equals the chip capacity.
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)