Melee/Wizard Death Test name mismatch

I loaded Meleewizard_2.2.vmod and DT1extension_1.0.vmdx and got

 Is it crabbing at me because I put "VASSAL-" in front of the filenames when I first downloaded them?

 What "game" was saved with an extension "loaded"?  I'm not reloading a saved game.  At this point, I just opened the module "Melee - Wizard".  I *had* previously loaded the Death Test extension, by putting it in just the right directory and then using some menu option to load an extension.  I never "saved" anything.  So now the extension is a permanent feature of the module?