Compressed RAR package labelled only as Dell 510, about 1.47 MB in size, with no board number, revision or document type given in the name. A file of this size usually holds a schematic PDF or a small boardview, but it must be extracted before you know for sure. Match the model against the sticker under the laptop and the motherboard number printed on the PCB before using it to trace power rails or signals. If it turns out to be a firmware image, back up the original chip before writing anything.
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 @schematicslaptop. 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.