[wp-hackers] URL Re-writes for WP 'Pages' or Multiple Permalink structures

[Borgar Þorsteinsson]

Set the permalinks to the wanted url omitting the .html.

With a plugin that filters on the_permalink (post_link?), and 
rewrite_rules. Add a rewrite rule that strips ".html" endings silently 
so both urls are valid. Something like "RewriteRule ^/(.*?).html?$ /$1 
[PT]" (untested) should do this.

Then have the "the_permalink" filter append ".html" if needed.

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Borgar Þorsteinsson