Archive of 2.19 MB carrying the label 3AESV-RH-11, apparently revision RH-11 of a board identified as 3AESV. The name gives no brand, model or description of the contents, which may be a firmware dump or service documents. Extract it with 7-Zip or WinRAR. Because neighbouring files cover RH-10 and RH-12, check the revision printed on your PCB to avoid mismatched data. Read and store the original flash contents with a programmer before attempting any write from this package.
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.