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dkAnim.mel is for Importing or Exporting animation channels in Maya. dkAnim has many advantages over Maya's import/export .anim plugin, read dkAnim.txt or the header of dkAnim.mel for more information.
This script was written a long time ago, actually surprised it's still useful.. guess that's either a testament to mel or a hit against Maya for not making this process easier out of the box.