Hi I am using Access 2013 after many moons ago developing databases in Access 97/2003. I am new to the whole concept of digital signatures. I have created my database and then split the front & back end successfully. But when I try to open the backend (to make design changes) I am getting the error 'This file is missing a digital signature and cannot be opened...'. I have tried creating and applying a selfcert from Office 2010 before splitting the database. I have tried making a accde of the front end but it still has the tables. I have searched google & this forum and I cannot anywhere find anyone having the same issues. Please help as I need to be able to edit the backend to be able to deploy the database! Cheers!