Archive covering the Dell Latitude E5270, E5470, E5570 and Precision 3510, referencing the SMDPC15H DSC design and Compal board LA-C831P, in a 15.4 MB rar. DSC usually denotes the discrete graphics version of the board, while LA- numbers follow Compal's ODM pattern. The contents are not listed, so extract it to see whether it holds a schematic, boardview or firmware. Whatever is inside, match the board number and revision printed on the PCB before relying on it for rail tracing or a flash.
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 @schematiclaptopramkushwaha. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.