There is only one file type that uses the .MPDP extension:
MixPad Project File
Audio project created by MixPad, a multi-track music mixing application; saves multiple tracks, each of which that can have its own waveforms, edits, and effects; can be exported to .MP3, .WAV, .M4A, or various other audio formats when mixing is complete.
MixPad supports audio recording as well as audio import from over 30 file formats.
NOTE: MixPad saves references to audio files rather than the audio data itself. A directory named myproject.mpdp.ProjectData is created in the same directory as the project file and stores the audio. Therefore, if you need to transport an audio project, you'll need to transfer this directory as well.
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Updated: August 7, 2012