RAR archive, 1.13 MB, for a Toshiba Satellite built on the board or project coded MA30. Contents, revision and laptop model are not stated, so extract it and compare its title block or board label with the markings on your motherboard. Schematics and boardviews of this kind are used to trace power rails and signal lines, locate components and test points, and find the cause of a short or a no-power condition. A matching revision is important, since layouts change between versions.
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 @alischematics. 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.