Sony RAR archive for the Quanta FI2 project at revision 1A, 1.69 MB in size. FI2 is the Quanta project code used on VAIO boards numbered DA0FI2MB, so this is most likely a schematic set for that platform. Quanta schematics are useful for following power sequencing, identifying rail voltages and locating protection components. The revision on the Quanta board label should be checked against the 1A in the documents, since later revisions can change parts and nets.
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.
7-ZipWinRARThe Unarchiver (macOS)