RAR archive for the Quanta U92 mainboard, part number DA0U92MB6D0, revision 1A; the name gives no laptop brand or model. The board number follows Quanta numbering, where DA0 plus project code plus MB marks the motherboard PCB. Inside the 935 KB package you can expect a schematic used to trace voltage rails from the DC jack through the charger to the CPU regulators and to identify parts around a short. Unpack it with 7-Zip or WinRAR, then verify the code silkscreened on the board before using component references from it.
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.