Thanks for the reply, Puybaret.

Got it - but not the first time! I thought it might help others if I explain what I had to do…

So as you suggested, I pasted in the run command “java -jar D:\Downloads\architecture_sweet home\FurnitureLibraryEditor-1.9.jar” (without the “” and got what looked like a DOS window for about half a second, then nothing.

I tried launching SH3D and then running the command prompt again. Still no better.

I then copied the file FurnitureLibraryEditor-1.9.jar onto the C drive and ran the command “java -jar C:\FurnitureLibraryEditor-1.9.jar” and it worked!

So either the file needs to be on the same drive as java **OR** my path was too long for the thing to work.
Thanks again for your help.
Best regards
DamCar.