Looking around the IMGFS, I found some undocumented capabilities that can be used in building an app (in addition to the standard ones mentioned in the WMAppManifest.xml file). These are the extra ones I found, in case anyone is interested (from BasePolicy.xml): ID_CAP_RINGTONE_ADD:Allows ringtone-marketplace applications to read/write into the Ringtones directory ID_CAP_MEDIALIB:Access to the med