RAR archive for the ASUS X541UVK laptop, 5.43 MB in size, with 308 in the name, which most likely refers to a BIOS version, though the contents are not listed. An archive of this size usually holds a firmware image or a few service documents, so open it and check what is inside before using it. If it is a BIOS image, it is written to the SPI flash chip with a programmer to restore a board that will not boot. Save the original chip contents first and make sure the motherboard revision matches.
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 @SCHEMATICWORLD. 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.