Boardview for a Dell 5070 system built on board 17538-1, provided in a 105 KB ZIP that the name says contains BFV and CAD format files. The five-digit number with a dash suffix follows Wistron's board numbering, so Wistron is the ODM behind this design. The CAD file opens in viewers like OpenBoardView or FlexBV and lets you find components, follow nets and locate test points during power or short diagnosis. Verify the 17538-1 number on the PCB, since Dell's similarly named models use different boards.
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.