An archive of repair files (board LA-3571P). Shared as “IGT30 LA-3571P (REV 1.0).zip” — a .zip file, 688 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 @IT_SERVICE_WORLD. 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