First of all, thank you for the kind message! And I'm totally fine with you exploring the files - it's actually quite easy to do on your own!
First, you need to buy RPG Maker XP, (or get the free trial). Then, start a
new project to generate a "game.rxproj" file. Paste that file into the main BoxxyQuest folder (where the .exe is) and open it. (Game.rxproj files are all interchangeable, they just tell the editor to open what's in that folder).
I'll apologize for my messiness in there, though. A lot of the behind-the-scenes stuff isn't named or organized very well. ^^;