The Palm versions of the earlier games do not create a savegame file, but rather store the game state in a way that's not directly user accessible. The only way to back up and recover your game progress is to use a backup program that will allow you to save "unsaved preferences." There is a thread discussing that situation here.

LDW now creates a separate savegame file for their games, starting with Village Sim on the Palm platform and all of their PPC games.