Not sure if this forum is still active, but here goes...

I saved a terrain in "PRT" format from the terrain editor. Now, coming back later, I cannot find a way to reload that file.

Is there a way to reload the PRT file? If not, why the Hell would they have you saving in a format you can't reload?

according to Google, that's a parts file for a CAD program. Can I ask why you didn't use TIFF?

If you create a terrain and go to the terrain editor, there is an icon that says, "Save terrain". If you click on that icon, it opens up a window to save the terrain as a "terrain model" (prt) file. There are no other file formats available in this "Save terrain" function. (yes, I know you can export the file instead of saving it, but it won't be exactly the same when you re-import it)

I understand that I should have gone out of the editor and simply saved the terrain as a "Vue Object" (vob) file. However, I still don't understand why they would have a "save" function for a format you can't reload. (and the fact that the terrain editor has a save function but doesn't have a load function) It just doesn't make sense...

it worked for me when I changed the file association to be Vue - Windows didn't understand what to do with the file. Seems a lot easier to export as a TIFF though - that's more useful IMHO

Indeed it does work with the association set to Vue, but that requires you to open the file in Windows thereby causing Vue to launch. There seems to be no way from within Vue itself to load the file.