Archive whose name points to the Z97-K R2 desktop motherboard, with 0903 most likely the firmware version, packed as a 4.69 MB RAR. The name says nothing else about contents, so open it and confirm whether it holds a BIOS image, a flashing tool or both. Such a package is used to recover a board that fails to POST after a bad update, either via the vendor flashing method or by programming the SPI chip directly. Make sure the board revision printed on the PCB matches R2 and keep a backup of the original chip.
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 @Satale_bios_esquemas_Laptop. 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.