RAR archive of about 8.7 MB whose name only suggests a latest build of MEA. The name does not say what MEA stands for, and it names no device or version. It could relate to Intel Management Engine tooling or firmware, but that is not certain. Open it with WinRAR or 7-Zip and read the included files before using anything inside. If it holds ME firmware or utilities, check that the ME generation matches the target chipset. Always keep a backup of the original SPI contents before writing a modified region.
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 @ZINFOSERVICECHANNEL1. 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.