There are really two issues here. The first is that Village Sim is available only for Palm OS. You may be able to run it on your Treo using a Palm emulator, such as StyleTap. I have run Village Sim that way on a Pocket PC, but I haven't tried it on a Treo.
The other issue is that the Windows Mobile version of Fish Tycoon supports only the rectangular screen format of the Pocket PC. The Treos have a square screen and will not be able to display the entire game area. You can download the free trial of the game and try it, to be sure.
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Barbara
Unicorn
Last Day of Work