Zip archive for a motherboard marked IS8XT, version 1.1, about 6.92 MB. Beyond the model and revision the name lists no contents, so unpack it to see whether it holds a firmware dump, a schematic or related service files. The size suits a full SPI flash image, such as one including Intel ME. Before flashing with a CH341A or similar programmer, confirm the PCB reads IS8XT ver 1.1, back up the existing chip, and confirm the image length matches the flash memory capacity exactly.
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 @laptopchiplevelrepair. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.