Boardview file for a mainboard identified only as 0P1B-MB, delivered as a small RAR archive of 134 KB. The name gives no brand, model or revision, so match the code against the marking on the PCB before use. A boardview shows the physical placement of parts and nets, which helps locate components, test points and the parts tied to a shorted rail while probing with a multimeter. Such files are usually opened with viewers like OpenBoardView, FlexBV or Boardviewer, depending on the exact format inside.
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 @schematicslaptop. 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.