RAR archive labelled as board material for the ASUS X550CL notebook, roughly 1.28 MB. No revision or board number is given in the name, and the exact contents are not listed, so extract it with WinRAR or 7-Zip and review what is included. Such packages typically supply a schematic or a boardview used to find components, follow power rails and check for shorts on the mainboard. Before relying on it, read the board revision printed on the PCB and compare it with the document title, because several revisions of ASUS X550 boards exist.
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.