What Is an MDE File?

A file with the MDE file extension is a Compiled Access Add-in file used to store a Microsoft Access MDA file in binary format.

Advantages of MDE files include a compacted file size, VBA code that can run but can't be changed, and the ability to edit data and run reports while shielding the user from having full database access.

Other MDE files might be unrelated to MS Access and instead be add-in files used with the architectural design software ArchiCAD to extend the program's functionality.

MDE files can be opened with Microsoft Access and probably some other database programs as well.

Tip: You can make an MDE file in Access through the Tools > Database Utilities > Make MDE File... menu option.

Microsoft Excel will import MDE files, but that data will then have to be saved in some other spreadsheet format like XLSX or CSV.

Graphisoft ArchiCAD's add-in files that have the .MDE file extension can be opened with that program.

Note: If you find that an application on your PC does try to open the MDE file but it's the wrong application or if you would rather have another installed program open MDE files, see our How to Change the Default Program for a Specific File Extension guide for making that change in Windows.

Read the instructions on Granite Consulting and Pruittfamily.com for some information on converting an MDE file to MDB.

Once the information in the MDE file is in the MDB format, you can convert the MDB file to ACCDB or ACCDE using Microsoft Access.

A tool like MDE Compiler should be able to convert your MDE file to EXE to create a standalone program.

If the programs above aren't working to open your MDE file, it's possible that you're misreading the file extension and you don't actually have an MDE file. 

For example, an Amiga MED Sound file and RSView Development Project file both use the MED file extension which is really similar to MDE but not the same. Even though they look like they might be related to Microsoft Access or ArchiCAD, they instead open with ModPlug Player and RSView, respectively. 

The same is true for other file extensions that might sound or look like "MDE," like MME which belongs to the Multi-Purpose Internet Mail format, or MDD which might be a Point Oven Deformation Data file or an MDict Resource file.

Are you sure that your file ends with the MDE file extension? There might be something else wrong if the file doesn't open with the programs linked on this page.

See Get More Help for information about contacting me on social networks or via email, posting on tech support forums, and more. Let me know what kinds of problems you're having with opening or using the MDE file and I'll see what I can do to help.