I've updated Opnapp a little bit. You no longer have to add ".app" to launch a file with an .app extension. For example, to launch Mail.app you can just enter Mail. This only works with .app files.
You can also open files and applications with spaces in their names now. When inputing the file names replace the spaces with two periods, like so: opnapp foo..bar.app and they will be converted spaces when launching the app.
