Compressed RAR archive of 703 KB labelled only with Dell and PP41L, which is a Dell regulatory model code rather than a motherboard number. The name does not say whether the content is a schematic, a boardview or a firmware dump, so unpack it with 7-Zip or WinRAR and check what is inside. Regulatory codes like this can cover more than one board design, so confirm the ODM board number and revision silkscreened on the PCB match the document before using it to trace rails or locate parts.
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 @cyberlanelectonik. 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.