An archive of repair files for HP hardware (board DAG3LDMBCD0). Shared as “DAG3LDMBCD0_G3LD_GN21-X6-A1_AD106.zip” — a .zip file, 955 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