Apple A2141 logic board archive for board 820-01041, labelled as a 512GB NAND data package. A2141 is the 16-inch MacBook Pro, and the 820- prefix is Apple's own logic board numbering. The name suggests NAND-related data for the 512GB configuration, but the exact contents (dump, schematic or notes) are not stated, so open the RAR and check before using anything. Confirm the 820 number printed on the PCB matches, and keep in mind that Apple storage is paired with the T2 security chip.
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 @hrtechno. 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.