ZIP archive from ASUS for the P7H55-M USB3 motherboard, where 1105 most likely denotes the BIOS release version. At 2.86 MB it probably contains a compressed BIOS image, though exact contents are not listed in the name. Such files are used to recover a board through EZ Flash or by writing the chip directly with an SPI programmer after extracting the ROM. Save the original chip contents before flashing and confirm the image size matches the flash capacity on the board.
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 @vinafix_bios. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip