PDF document named after the MSI-style board code MS36631-ZC01-01; no device model or brand appears in the name itself. At 25.2 MB it is a substantial file, likely a full schematic set covering power, signal and connector pages. Schematics like this let a technician trace rails, identify component values and follow signals when diagnosing a dead or faulty board. Open it in any PDF reader and confirm that the code on your PCB matches, including the trailing revision digits, before trusting values.
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 @pdf_servicemanual. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.