Archive of 2.66 MB named SVOD3 with version 1.0.6.2; the name gives no device, brand or board information. It does not look like a firmware dump for a particular motherboard, and may be a software tool or reference database. Extract it and inspect the contents before use, and scan unknown executables before running them. If it does contain flash images or board data, compare any embedded identifiers with the markings on the PCB before writing anything to a chip.
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 @BiosSchematicBoardviewNoLimit. 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.