Short-named ST6 boardview, BV meaning boardview, for the Lenovo board coded DAOST6MB6E0 by Quanta, packed in a 430 KB ZIP. The name gives no further revision or model details. Quanta uses DA0 codes where the middle letters name the project, here ST6. A viewer such as OpenBoardView or FlexBV shows part placement and net connectivity, useful for locating components from the schematic and checking a shorted rail. Confirm the code printed on your board before relying on it.
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.
Built-in OS tools7-Zip