Weeeelllllll . . .
I did a few searches on the usual sites (SimV, AVSim, Flightsim, etc) as well as a few Google searches.
You spelled it wrong, is probably why you couldn't find much about it. Its "Guppy" instead of "Guppie". Not a big deal, but on the net, spelling does count!

However, you probably wouldn't have found much, anyway. I searched all my usual sites and found zilch (aside from an FS98 version on Flightsim), so switched to Google and looked through every permutation I could think of for Guppy and Flight Simulator, to no avail.
Maybe one doesn't exist?

Weird . . .