Small RAR archive of 137 KB named 09A21-1, with no brand, device or content type indicated. The name is not informative, so extract it and inspect the contents before use. At this size it could be a boardview, a firmware dump or a short document. Boardviews open in OpenBoardView or FlexBV. For a binary image, confirm that its size matches the flash chip, and back up the original chip with a programmer before writing anything.
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)