An archive of repair files (board NM-F281). Shared as “NM-F281 KB640 vbios 4060 gn21-x4-a1.7z” — a .7z file, 445 KB.
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 @boardsscanrepo. Enginerys does not host this file.
How to open a .7z file
High-ratio compressed archive, often used for large BIOS collections.
7-ZipWinRARKeka (macOS)