ZIP archive whose name suggests HexCmp, a hex comparison utility, though the name gives no version or other details. A tool of this kind compares two binary files byte by byte, which repair technicians use to check a BIOS dump read from a chip against a reference image. It also helps spot differences in serial or ME regions, or verify that a programmer write matched the source file. At 487 KB it holds only the program, so scan it before running and confirm what it contains.
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 @CLRINDORE. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip