I found the solution in that post http://mono-for-android.1047100.n5.nabble.com/Designer-and-r20-td5710704.html
That's because I installed the API 16 and there's a bug with the designer if it is. Thanks and sorry for the post. -- View this message in context: http://mono-for-android.1047100.n5.nabble.com/Can-t-open-any-axml-files-with-the-Android-Designer-tp5710741p5710742.html Sent from the Mono for Android mailing list archive at Nabble.com. _______________________________________________ Monodroid mailing list Monodroid@lists.ximian.com UNSUBSCRIBE INFORMATION: http://lists.ximian.com/mailman/listinfo/monodroid