RAR archive for an FIC board identified as MY050, revision 0.4, most likely holding the schematic set for that mainboard. FIC (First International Computer) built notebooks and desktop boards under its own name and for other brands, so the MY050 code may appear on machines sold under a different label. Extract it with WinRAR or 7-Zip; the contents are usually PDF pages showing power rails, signal nets and component references. Confirm the board code and revision 0.4 silkscreened on the PCB before following any net or measurement value.
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 @IT_SERVICE_WORLD. 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.