Types of EDMX Files

Dominant EDMX File Type

.EDMX

File Format:	.edmx
Category:	ADO.NET Entity Data Model Designer File

It is a data model file associated with the Entity Data Model Designer which is a Microsoft Visual Studio component. The EDMX file stores the database schema which includes entities, their fields, as well as their relationships (such as one-to-one or one-to-many).

Programmer:	Microsoft Corporation
Class:	Developer Files
Location:	HKEY_CLASSES_ROOT\.edmx

Software Programs That Open The ADO.NET Entity Data Model Designer File:

Microsoft Visual Studio by Microsoft Corporation

Windows

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EDMX Troubleshooting

Typical EDMX Opening Challenges

Microsoft Visual Studio Isn't There

When trying to open your EDMX file, you get the error "Can't Open EDMX File Type". If this is the case, it's usually due to the fact that you do not have Microsoft Visual Studio for %%os%% installed on your computer. Because your operating system doesn't know what to do with this file, you won't be able to open it by double-clicking.

Tip: When you have another program installed that you know will open your EDMX, you can select it from the other programs listed (see "Show Apps").

Outdated Microsoft Visual Studio

In other instances, your ADO.NET Entity Data Model Designer File file version may not be supported by your version of Microsoft Visual Studio. If you do not have the proper version Microsoft Visual Studio (or any of the other programs listed above), you may need to try downloading a different version of it, or one of the other software applications listed above. This issue mainly occurs when your ADO.NET Entity Data Model Designer File file was created by a newer version of Microsoft Visual Studio than you have on your PC.

Tip: Right-clicking on your EDMX, then clicking "Properties" (Windows) or "Get Info" (Mac), can provide clues about your file version.

Ultimately, most of the difficulties opening EDMX files are due to having the wrong version of Microsoft Visual Studio installed.

More Causes of Problems Opening EDMXs

In the majority of cases, installing the right version of Microsoft Visual Studio will resolve your issue. If you are continuing to have errors with loading EDMX files, other external issues might be to blame. Issues that aren't software-related:

• Invalid EDMX file references in the Windows Registry (the "phonebook" of the Windows Operating System)
• The EDMX file description within the Windows Registry was removed
• Invalid installation of a EDMX-associated program (eg. Microsoft Visual Studio)
• Something has caused file corruption of your EDMX
• Malware-tainted EDMX file can't be opened
• Hardware associated with EDMX has outdated drivers
• Your PC doesn’t have enough available resources to open the ADO.NET Entity Data Model Designer File file