Compressed archive for the ASUS X550ZE laptop, 1.17 MB in RAR format. The name says nothing more, so the contents could be a BIOS image, a boardview or schematic material, and you will only know after opening the archive. Once extracted, compare any board number and revision inside with the label on the motherboard before relying on the files. Firmware images should be checked for the correct size against the SPI chip, and the original chip should be backed up 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.