RAR archive of 570 KB for the ASUS X550LD notebook; the name does not say whether it holds a schematic, boardview or other files, and no board revision is listed. Open it to see what is included before planning a repair. Service material of this type helps trace power rails, identify components on a failing circuit and find test points for measurement. Many X550-series boards exist in several revisions, so match the revision printed on your mainboard against the documents inside before relying on them.
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.