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Copy Z-coordinate from S57 SOUNDG to Shp

I'm trying to create a shapefile from an S57 SOUNDG Layer, where i want to put in in a separate column the Z-coordinate of the SOUNDG Layer in the resulting Shapefile....any ideas on how to achieve ...
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How to open the Electronic nautical chart S-57 data?

Anyone know how to open the Electronic nautical chart S-57 data by using GIS software e.g. Arcview, QGIS? and converted it to general GIS / CAD formats. Thanks.