Software package named LCIIT 2UUL PC Interface Tool, delivered as a 30.7 MB zip archive. The name gives no supported hardware, version or documentation, so open the archive and look for a readme or setup notes before running anything. Service utilities of this kind usually talk to a device over USB or serial for diagnostics or programming. Scan the files with antivirus software and test on a spare machine, since tools of unknown origin can carry unwanted code.
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 @lciitworld. 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