424 KB RAR archive holding a boardview (BDV) for the LA5891 board. The name gives no brand, model or revision, and the board number has no suffix. It looks like Compal-style LA numbering but is not confirmed. Boardview files map every component and net on both sides of the PCB, helping locate a shorted capacitor, a test pad or a connector pin. Extract it and open it with a boardview program such as OpenBoardView or FlexBV. Match the PCB marking before relying on it.
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.