Adding the Tc3 XTS Utility library

Adding the Tc3 XTS Utility library 1:
Expand Solution Explorer > TwinCAT Project > PLC > Untitled > Untitled Project
Right-click on References to open the context menu
In the context menu click on Add library ...
Adding the Tc3 XTS Utility library 2:

The dialog box Add Library opens.

Expand (Miscellaneous)
Click on Tc3_XTS_Utility
Confirm with OK

The Tc3_XTS_Utility library is added.