Boardview archive for a motherboard numbered 6050A2945601, revision A01 as given in the name. The 6050A prefix follows the Inventec / Foxconn numbering pattern used on many HP business notebooks, though the name does not state the laptop model. Inside the RAR you can expect a board layout file that opens in a viewer such as OpenBoardView or FlexBV, letting you locate components, follow nets between parts and find test points while measuring rails. Confirm that the number and revision silkscreened on the PCB match before trusting part positions.
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 @BoardSchematic. 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.