RAR archive of 1.11 MB for the TP550LD notebook, marked revision 2.0 in the name. The contents are not listed, so extract it to see whether it contains a schematic, boardview or both. A schematic is used for tracing power rails and signal paths, while a boardview locates components and test points on the PCB and opens in viewers such as OpenBoardView. Make sure the revision printed on the motherboard matches 2.0, since different revisions can change component placement and values.
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 @alischematics. 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.