Archive of 6.39 MB labelled FIT 15.0.10.1447, most likely the Intel Flash Image Tool from the CSME 15 system tools package. FIT is used to open, edit and rebuild full SPI images, for example to insert a clean Management Engine region or change descriptor settings before flashing. CSME 15 belongs to Intel's Tiger Lake generation platforms. Use the tool version that matches the ME firmware on the target board, and keep a backup of the original chip dump before writing a rebuilt image.
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.