The ACCDE extension is used by Microsoft Corporation's Access Platform program from 2007 (Mac 2008). It serves to identify files containing a "completed" version of an accdb file. These files are sometimes referred to as executable access files.
In contrast to the accdb files, the user of an ACCDE file can not make any changes to the design of the forms or reports. If the file VBA (Visual Basic for Applications) contains scripts or other modules, these are only available in compiled form. The user of the file can not change the scripts. However, normal database actions are possible.
Earlier versions of Microsoft Access use the ending mde for these types of files.