Finally something worked, I got your terminal emulator running. A couple of things. In your rxvt thread  Walter822 had exactly the same error message trying to run a desktop file that I am having. I must say that 'misery loves company'.
I have attached the photo, as per your suggestion, of the terminal emulator. I am surprised at the results. The first "not found" error was a typing mistake by me. The second was not. It says that the .sh file is not found in the _dr800+ directory yet I can see it. I tried renaming the directory and the file back to the same names just in case there were any nonreadable characters present. It didn't make any difference. I think that one of my earlier attachments shows that the file and directory are there. The names certainly appear to be correct.
Thanks for all your time so far...........jackie