Unbranded RAR archive of 828 KB named 400-1-4-01-RA. The name follows the same pattern as other files here, with a numeric code and a trailing RA that probably indicates revision A, though no device or manufacturer is given. Open it with a RAR-capable tool to see whether it holds a schematic, a boardview or a firmware dump. Match the code against PCB silkscreen markings, and if it contains a firmware image, back up the original chip before flashing.
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 @cyberlanelectonik. 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)