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What are you trying to do exactly?
Are you trying to use your existing HTML pages with your content?
Existing PHP scripts? Or combination of both?
You've mentioned both HTML/PHP, but it would be good to know what they do?
Also, if it is more for content, how much content are we talking about? 10 pages? 100? 1,000?
Tell us more, or even point us to the content you would like to move to XOOPS, and we'll be glad to help you with the right method...