Compressed RAR archive, about 339 KB, for the Z97-PRO motherboard. The file name mentions only the model, so its contents and the board revision are unknown until it is unpacked. At this size it most likely holds layout or document files rather than a large image, but check after extracting. Boardview files can be opened in OpenBoardView or FlexBV for locating parts and tracing nets. A separate Z97-PRO boardview at revision 1.01B also exists, so compare revisions to choose the file that matches the board on your bench.
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 .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.