In the Access ecosystem, an MDE file is a "compiled" version of a database. When a database is saved as an MDE: VBA source code is removed. Forms and reports cannot be modified. The design of the database is protected from changes.
: Be cautious of websites claiming to offer "cracks" or "free registration keys" for version 3.20. These files often contain malware or security risks . How the Software Works
There are specialized data recovery firms that handle corrupted or locked databases with high success rates and better data privacy guarantees. Protecting Your Databases for the Future
What was used to create the database? Are you trying to modify code or just export information?