RAR archive of 917 KB named 2MC61SFE-13. The name is cryptic: it gives no brand, document type or device, and the trailing 13 may be a version or revision index. It probably refers to an MCP61-based desktop board, but that cannot be confirmed from the name. Extract it to see whether it holds a BIOS image, a schematic or a boardview. If it is a firmware dump, match the board and chip size and back up the original flash before programming.
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 @schematicslaptop. 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)