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In latest Microsoft Access database program users can still save databases in the previously used MDB format. Even new templates (.accdt files) can be used in making of the new databases, however some features exclusive to latest Access may not be saved in the old format, for compatibility purposes.
Updated: April 11, 2022
ACCDT
Files with accdt file extension can be usually found as database templates for Microsoft Access database management software. Introduced first in version 2007.
MDB
An mdb file extension is used by Microsoft Access database management system for its main database files. MDB format was replaced in later version of Microsoft Office by ACCDB format. Access mdb databases can usually be opened in or imported to most database management systems, such as dBase, Oracle etc.