Unlock Access MDE unlocks Microsoft Access MDE, ADE and ACCDE files for editing. If you have lost the original MDB/ADP/ACCDB file and need to make simple design changes to the application this is the ideal software tool. The software unlocks the MDE application allowing you to edit forms and reports in Microsoft Access. You can change the way the application works using Microsoft Access macros and expressions, but you can not change or view the VBA code. The code will continue to work the same way while the MDE application is unlocked and when you re-lock it later.