An archive of repair files for Razer hardware. Shared as “Razer rz09-0421 apf21006_mb.7z” — a .7z file, 36.6 MB.
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)