Known DDF Files

Dominant DDF File Type

.DDF

File Format:	.ddf
Type:	Diamond Directive File

A DDF file is used to give property specifications for a .CAB file compression. The file is saved as a plain text and should only be modified when necessary.

Author:	Microsoft Corporation
Kind:	Settings Files
Subkey:	HKEY_CLASSES_ROOT\.ddf

Software Programs That Open The Diamond Directive File:

Microsoft Notepad by Microsoft Corporation

Windows

Mac

Linux

Microsoft WordPad by Microsoft Corporation

Windows

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DDF Troubleshooting

Typical DDF Opening Challenges

Microsoft Notepad is Not Installed

If you attempt to load your DDF file, you experience a message such as "Can't Open DDF Files". Generally, this is experienced in %%os%% because Microsoft Notepad isn't installed on your PC. 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: If you know of another program that can open your DDF file, you can try opening it by selecting the application from the programs listed.

Incorrect Microsoft Notepad Version

In other instances, your Diamond Directive File file version may not be supported by your version of Microsoft Notepad. If you've got the wrong version of Microsoft Notepad installed, you'll need to install the correct version. Your Diamond Directive File file was probably created by a newer release of Microsoft Notepad than what's currently installed your computer.

Tip: Investigate your DDF file by right-clicking and selecting "Properties" to find clues on what version you need.

Regardless, most of the DDF file opening problems relate to not having the right version of Microsoft Notepad installed.

Other Causes of DDF File Opening Problems

In the majority of cases, installing the right version of Microsoft Notepad will resolve your issue. If you are continuing to have errors with loading DDF files, other external issues might be to blame. Other contributing causes:

• DDF file type Registry entries are wrong
• Deletion of the DDF file description from the Registry by mistake
• Microsoft Notepad or another DDF application experienced a flawed installation
• Your DDF can't be loaded properly (file corruption)
• The DDF is infected with a virus
• DDF-related hardware has device drivers that obsolete
• Your PC doesn’t have enough available resources to open the Diamond Directive File file