Windows EWriter eBooks are really WebHelp packaged in a single file together with an integrated viewer. The topic page layout is defined by the same HTML page templates that are used for the topic pages of HTML Help and WebHelp. The Layout, TOC, Keyword Index and Search pages are defined by the same templates used for WebHelp. Normally, you will use a WebHelp skin to publish EWriter eBooks.
See EWriter eBooks for Windows in the Publishing chapter for full details.