In its PC version, TNCdiag allows you to save a session as a reference session (extension: *.tncdr). Instead of embedding the service file in the session file, TNCdiag inserts the path to the service file as a reference.
If you rename the service file or move it to another location, TNCdiag will no longer find the referenced service file when loading the session and will display the following dialog box.
If you relay a reference session (*.tncdr) to a colleague or a HEIDENHAIN service agency, you need to include the service file.