Harpoon 3.6.3 Full screen?
 

I guess I'm not the forst person to run into this snag. But how do I get H3.6.3 to run full screen in 1280x1024?

You can get your H3.6.3 to run in full screen by first going into your Options folder. If you used the default directory paths suggested by the installer, you should find it here:

C:\Matrix Games\Harpoon 3 v3.6.3\Options

There should be a file named: RunInWindow.opt

Move this file into the C:\Matrix Games\Harpoon 3 v3.6.3\Options\Disabled sub-folder and start the game.

Caution: H3 does not work well with large screens. The full window is used, but you may find that the range circles become elongated ellipses.

For best results, don't forget to install the PlayersDB. Harpoon3.6.3 users can get the:
Complete PlayersDB Harpoon 3.6.3 Library