Small 7z archive, only 232 KB, labelled Quanta H97A, a Quanta project code. At that size it more likely holds a boardview or firmware image than a full PDF schematic, but check after extracting. Quanta boards carry the project code in the DA0xxxx number on the PCB, which should match before use. If the file is a dump, read and save the original SPI chip with a programmer first, and confirm that the image size equals the chip capacity.
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 @schematiclaptopramkushwaha. Enginerys does not host this file.
How to open a .7z file
High-ratio compressed archive, often used for large BIOS collections.
7-ZipWinRARKeka (macOS)