ScotchMonkey: Tried it multiple times, no luck. Not even an error message. So I'm curious if this just doesn't work on the GOG version.
DeMignon: It works with the GOG version.
1. Start with a fresh installation of Uru. Don't install it into Program Files but a custom location.
2. Start the game. It should by default be set to 800x600. Create your character and close the game.
3. Start the
patcher, select "Uru: Ages of Myst", select the installation folder and type in your preferred resolution in the boxes at the bottom of the patch window (I tested it with Width: 1680, Height: 1050). Click the Patch button.
4. Right-click the game's shortcut on your desktop and select Properties. In the Target field add: -iinit To_Dni
It should look something like this: "C:\GOG Games\Myst Uru Complete Chronicles\UruExplorer.exe" -iinit To_Dni
Apply the changes and use this shortcut to start the game.
That works. For some reason the custom folder worked (not program files). Also your graphics settings must be set at the startup and only that one time, adjusting them later though the launcher will revert the game to 800x600 and muck everything up. Thanks for the help everyone!