RAR archive for R9550L, version tag V10, 342 KB. The name states no manufacturer, board number or file type, so it is unclear whether it holds a schematic, boardview or firmware image until you extract it. Once you know the contents, check that the model and PCB revision match the board on your bench before tracing circuits or locating parts. If it is a firmware dump, read and save the original chip with a programmer first and confirm the image size fits the flash.
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.