Comment 1 for bug 391345

This error occurs because bzre tries to invoke subprocess.Popen for 'wordpad' as editor. subprocess.Popen requires full path to application.

In the same situation bzrlib/msgeditor.py uses subprocess.call function. I think we need to use call() in bzre too.

As short-term workaround you need to specify full path to the editor in your bazaar.conf (use qconfig dialog to edit it).