Guys, this is ok using Files and going to "System/mnt/extSdCard," but
easier is to use Files and open "External Card", right there, above "Systems", and you will not even
receive the warning. It works for my Galaxy II S, my Galaxy Tab 10.1,
and my Galaxy Note 10.1. But as per now (Nov 2012) the Applet with card
detail insists in not working. In fact it is useless because the very
same information and accesses we obtain from the icons in main screen.
This is a good application, indeed. Cheers...