Boardview for a board referred to as BA50, revision r22, in a 267 KB archive. The name gives no brand or model, so match the BA50 code and revision against the silkscreen on your PCB before relying on it. A boardview maps component locations and net connections, helping to find test points, measure rails and locate the part pulling a line to ground. Open it with a boardview program such as OpenBoardView or FlexBV; other revisions of BA50 exist, so pick the one that matches exactly.
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 @LaptopsBoardview. 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.