Quanta BD6 mainboard package, board number DA0BD6MB8D0, revision 1A, in a 950 KB RAR file. No laptop brand appears in the name, but the DA0...MB numbering is Quanta's own scheme, printed on the PCB near the edge or under the memory slots. The archive likely includes a schematic and possibly a boardview for OpenBoardView-type programs. Use it for rail tracing, short hunting and identifying component locations, after matching the revision.
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.
7-ZipWinRARThe Unarchiver (macOS)