Dell archive named after PP41L, which is a Dell regulatory model code rather than a motherboard number; the name states nothing about the content type, board revision or ODM. The 657 KB RAR file most likely holds a schematic or related service document for that chassis. A technician would extract it with 7-Zip or WinRAR, identify what it contains and then use it for tracing rails or locating components. Because the regulatory code can cover several boards, match any board number inside against the PCB.
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 @IT_SERVICE_WORLD. 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.