Converting DEM file to Mike format

Hi,
I am trying to convert a DEM file to Mike format using MikeZero tool box. However, the toolbox needs DEM in ASCII format. That means, as I understand, an additional step is needed to convert a DEM file to ASCII. Any suggestions accomplish this step? I don't have access to ArcGiS. In the DEM file folder there are some .adf files and a sta.bmp file.

Cheers,

Amanjot