Autodesk exchange files (.adsk) are used to share content between various solutions developed by this company so it is likely that you can import adsk files to Revit as well. Once the data have been properly loaded, they may be used for making a new or altering existing Revit project (.rvt), which more or less achieves adsk to rvt conversion.
It is unlikely that 3rd party apps support .adsk files, so using Autodesk programs seems to be the only viable way.