I use EZ-Landclass2 to create the land & waterclass. I don't recall getting EZLC to work...
Here's Dirk's readme saved as a pdf, useful as a tutorial document, together with a list of the landclass numbers used. The left-hand column is the nnnh2sun texture I found that displayed (if you're working in the SWPTO area) when I experimented with this useful tool.
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