What is an ACCDE file? A file with .accde extension is a Microsoft Access 2007 file format for creating Execute Only database files to protect custom database code. It compiles all VBA code into executable only so that it cannot be viewed or edited. ACCDE file format is replacement fo MDE file format that was used by earlier versions of Microsoft Access. ACCDE are ACCDB files in executable only mode and more compact due to absence of any source code.