Here is a 100% working message:
MessageBox( "/Maps/SingleMissions/SecretIsle2_1/MissionSStartText.txt" );
In your case, the path will be:
"/Maps/SingleMissions/your map name/li0.txt"
First, you need to create this text using the editor, for example, in CustomGoal (don't forget to delete the line later).
I generally don't recommend overloading the script with unnecessary commands.
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