RAR archive with the Intel Flash Image Tool, release 9.0.22.1467, from the ME 9.0 toolkit for 8-series chipset systems. FIT reads a complete flash dump, separates the descriptor, ME and BIOS regions and can regenerate an image with a freshly initialised Management Engine. Repair shops use it for ME cleaning before writing the SPI chip with a programmer such as a CH341A. Match the tool to the ME firmware branch of the dump and keep an untouched backup of the chip before any 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 @mfittool. 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.