Z80man, I hate to tell you this, but that strategy will almost certainly fail. The reason is that the USB dump isn't actually a dump of the Prizm's internal memory. It's a dump of the virtual memory, which is entirely overwritten during USB transfer to make room for that folder that appears on your desktop. Take a closer look at the file structure. You'll notice that everything is organized into the directories and the sections are each named with the name of the folder. The files from each folder are likewise under in the same sections.

In other words, it's the hex version of what you see on the screen.

Also, I took the liberty of simply disassembling the exe to look for valid code and there's nothing that I would call valid in the entire file. I suspect compression, but I don't know how that would work.