Boardview for the ECS H61H2-M2 desktop motherboard, an Intel H61 chipset board judging by the model name, compressed into a 343 KB RAR archive. No revision is stated, so compare the version printed on the PCB before relying on part placement. A boardview shows component outlines, pin nets and test points, letting you follow a VRM rail, find a shorted capacitor or trace a signal back to the chipset. Depending on the file inside, it can open in OpenBoardView, FlexBV or a similar layout viewer.
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 @SCHEMATICWORLD. 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.