Yes, I noticed at some time also that zipped disk images is not supported. So you have to unzip the disk image first and try again. That's ok for the moment that zipped images is not supported. However, it would be nice to have a setting where its possible to specify the "default" folder that will be shown when browsing for images (instead of the startup dir, which appears to be the root dir). I searched in the configuration file, but no setting seams to apply for setting the default directory.