RAR archive for the Dell E7440 built on Compal board LA-9591P, revision 1.0, 7.21 MB. The name does not list the contents, so it most likely holds the schematic and possibly boardview files for that board. LA-numbered boards come from Compal, the ODM behind many Dell laptops. Extract it with a RAR-capable tool, then use the documents to trace power rails, find test points and check shorts, confirming LA-9591P and revision 1.0 on the PCB before relying on any value.
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.