ZIP archive for the Gigabyte GA-Z97-HD3 motherboard, revision 1.0, around 1.8 MB. The name does not reveal the contents, which may be schematics, boardview data or a BIOS image, so open it and identify each file. Gigabyte prints the revision near the board edge, and it must match 1.0, since later revisions of the same model can differ in parts and layout. Such material helps trace power rails, locate components and recover firmware. Back up the existing SPI chip before writing any image.
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 @boardview. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.