An archive of repair files for HP hardware (board LA-B181P). Shared as “la-b181p zpl40_50_70 probook 450 g2.zip” — a .zip file, 6.55 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 .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip