The File Extensions Database

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.DD File Extension

  • Developer by: Symantec
  • Category: Compressed Files
  • Format: Binary

What is an .DD file?

.DD is DiskDoubler Archive

Compressed file archive created by Macintosh DiskDoubler for Mac OS Classic; uses the LZ78 compression algorithm; compresses files in place on the hard drive, which are expanded on-the-fly when opened; compressed automatically in the background using AutoDoubler.

DiskDoubler was later replaced by Now Compress and Stuffit SpaceSaver. DiskDoubler is not available for Mac OS X.

Programs that open DiskDoubler Archive
File Viewer Plus
The Unarchiver

How to solve problems with DD files

  • Associate the DD file extension with the correct application. On :
    Windows: Right click on any DD file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.DD files". Mac: Right click (or Ctrl-click) the DD file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .DD is DiskDoubler Archive. Because only the current version supports the latest DD file format. Search, therefore, e.g. on the Symantec manufacturer website after an available .DD is DiskDoubler Archive update.
  • To make sure that your DD file is not corrupted or virus-infected, get the file again and scan it with antivirus software.