Compressed RAR package for the ASUS P8Z77-V LX motherboard, roughly 711 KB, with the name giving only the model. Contents are not described, so unpack it to see whether you have a boardview, a schematic or both. Such files help when tracing a dead standby circuit, checking for a shorted VCore phase or finding the SPI BIOS chip and its supply. If an FZ file is inside, it opens in OpenBoardView or FlexBV. Confirm the board is the LX version and note the PCB revision, as layouts change between 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.