Ok here is my problem. When I get an attachment in K9 mail. I can do nothing with it. A box will pop up showing the attachment, and it will have the open and save button as it should. But if I click on open, it says "Unable to find viewer for application/vnd. openxmlforats-officedocument. spreadsheet.sheet." If I click on Save it says "unable to save attachment to SD card" Anyone have any ideas?