Large 7z archive of 56 MB for MSI board MS-15821 revision 2.1, with a GN20-P0-A1 GPU marking in the name. The size suggests a fuller package, possibly schematics, boardview and firmware together, but contents are not listed. MSI uses its MS-number pattern on the PCB silkscreen, which must match along with the revision. Use the materials to trace power rails and GPU circuits, locate shorted parts and check test points, and back up any chip before writing firmware from the set.
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 @boardsscanrepo. 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)