[DjNDB]

The prefs.prop of each episode should be copied to a folder named like the episode. It looks like the naming is a bit different in the zip file though. Here's the Mapping:

Tales of Monkey Island 101 = Launch of the Screaming Narwhal
Tales of Monkey Island 102 = The Siege of Spinner Cay
Tales of Monkey Island 103 = Lair of the Leviathan
Tales of Monkey Island 104 = The Trial and Execution of Guybrush Threepwood
Tales of Monkey Island 105 = Rise of the Pirate God

Let's try this for the first episode.
Do you have a "Launch of the Screaming Narwhal" folder in "\My Documents\Telltale Games\"?
That's where the prefs.prop from the zip folder "Tales of Monkey Island 101" should be copied to, replacing the old one.