Z97-P motherboard material packed in a RAR archive of about 249 KB. The file name says nothing about what the archive holds, so whether it includes a boardview, a schematic or other documents can only be seen after extraction, and no revision is given. Boardview files from such packages normally open in OpenBoardView or FlexBV and help with locating parts, tracing rails and finding test points. Whatever is inside, check the revision listed in the files against the marking on the PCB, because layouts change between board revisions.
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.