DMSE
From Just Solve the File Format Problem
DMSE is the format used to save projects in the Sound Editor in Roxio Creator. It contains references to audio files, but not the files themselves, so they are not self-contained. They do, however, store changes to the audio files so that the original files aren't altered when changes are made within the editor.
File Information
DMSE files are in a tagged text format. Files begin with:
<SoundEditorGroup>
<Clips>