Zip file of 920 KB for the Gigabyte GA-G31M-S2L, an Intel G31 micro-ATX motherboard. Nothing in the name indicates the revision or whether the package holds a schematic, boardview or BIOS, so the contents must be checked after extraction. For board-level repair such files are used to follow the power sequencing, locate the voltage regulator MOSFETs and controllers, and find the BIOS chip for reflashing. When the archive contains a BIOS image, back up the existing chip contents with a programmer first and make sure the dump matches the board revision and flash size.
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 @cyberlanelectonik. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.