RAR file of 2.10 MB tagged 3CCWV-RH-10, a code that appears to identify a board with revision RH-10. Brand, model and the type of material inside are not stated, so the archive has to be opened to learn whether it is a BIOS dump, schematic or layout. Use WinRAR or 7-Zip to extract it. Before flashing any binary it contains, make sure its size equals the capacity of the target flash chip. Keep a backup of the original contents, and verify that the board identifier on the PCB matches.
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.