Software archive containing Intel Flash Image Tool (FIT), version 18, part of the Intel CSME system tools kit. FIT is used to open a full SPI image, view and edit descriptor, ME and BIOS regions, and build a clean firmware image with a fresh ME region for repairs. Version 18 corresponds to CSME 18 firmware, so match the tool version to the ME generation in your dump. Work only on a copy of the original chip read, and verify the output size equals the flash 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 @fixtronix. 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)