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What is a DDL File?

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Question: What is a DDL File?

Did you find a DDL file on your computer and wonder what program should open it? Maybe someone emailed you a DDL file but you're not sure how to use it. Perhaps you tried to open the DDL file but Windows told you that it could not open it.

Before you can open a DDL file (assuming it's even a file format that's intended to be viewed or edited), you'll need to determine what kind of file the .DDL file extension refers to.

Answer: A file with the DDL file extension is an SQL Data Definition Language file.

Other types of files may also use the DDL file extension. If you know of any additional file formats that use the .DDL extension, please let me know so I can update this information.

How To Open a DDL File:

The easiest way to open a DDL file is to double-click on it and let your PC decide which default application should open the file. If no program opens the DDL file then you probably don't have an application installed that can view and/or edit DDL files.

Warning: Take great care when opening executable file formats received via email or downloaded from websites you're not familiar with. See my List of Executable File Extensions for a listing of file extensions to avoid and why.

DDL files can be opened with EclipseLink, IntelliJ IDEA, or any other text editor.

If you know anything else useful about DDL files, please let me know so I can update this page.

Tip: Use Notepad or another text editor to open the DDL file. Many files are text-only files meaning no matter the file extension, a text editor may be able to properly display the file's contents. This may or may not be the case with DDL files but it's worth a try.

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

How To Convert a DDL File:

There are two main ways to attempt to convert a DDL file to another file type:

The first option involving opening the DDL file in its native program is preferable because it's both easier and will probably result in a more accurate file conversion. Of course if you don't have a program that opens DDL files, a third-party file conversion tool (the second option) could be very useful.

Important: You cannot usually change a file extension (like the DDL file extension) to one that your computer recognizes and expect the newly renamed file to be usable. An actual file format conversion using one of the methods described above must take place in most cases.

Still Having Problems Opening or Using a DDL File?

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 DDL file and I'll see what I can do to help.

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