Zipped schematic, 1.54 MB, for a Quanta motherboard identified as DA0PF5MB6A2; the brief file name adds no laptop model. Quanta numbers boards DA0 plus a project code and MB, and the final characters indicate the PCB revision. Technicians use the diagrams to check power rails, the charger and EC circuitry and to follow signals while chasing shorts or missing voltages. Extract the PDF and confirm the code printed on the PCB, including revision, before relying on component values.
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 @cynetitsolution. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.