Hello all :), I got a Nokia 770 this January and I was thinking to develop some aplication on it (not sure what about yet). To start, I wrote the example "Hello World" program, executed it in the scratchbox (for PC and ARM) and it worked fine. The problem is when I put the app in the Nokia 770 and try to execute it because I get an "unknown file type" (both with the PC and ARM compilation). I don't know if it would be necessary an extension or to create an installation for the program. I also tried to install mono on the Nokia 770 but couldn't get it working too. Thank you Antonio