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The folders html, extras and docs don't need to be placed on your server. Only the
contents of the XOOPS html folder need to be on your server, and you can place those contents in the root directory or in any subdirectory.
If you place the contents of the XOOPS html folder in a subdirectory on your server, such as /xoops (which I think is tidier than placing the files in the root), then you can place an index.php in the root that redirects to /xoops:
('Location: http://example.com/xoops/') ?>