An archive of repair files. Shared as “EM_IC819_DB_RJ45_V10_RTL8111H+RTS5170.zip” — a .zip file, 485 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 .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip