IfyourPCopenstheD04file,butit'sthewrongapplication,you'llneedtochangeyourWindowsregistryfileassociationsettings.Inotherwords,WindowsisassociatingD04fileextensionswiththewrongsoftwareprogram.
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If your PC opens the D04 file, but it's the wrong application, you'll need to change your Windows registry file association settings. In other words, Windows is associating D04 file extensions with the wrong software program.