RAR archive of roughly 3.81 MB that, according to its name, holds a schematic in PDF format identified only by the code GM5MPHY. The name does not state the brand, device or revision, so the contents should be checked against the board in hand before use. A schematic like this helps with tracing power rails, finding where a short sits on a rail and following signal paths between chips. Unpack it with WinRAR or 7-Zip and compare the board code and revision printed on the PCB with the title block in the drawing.
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.