RewriteBase /forum
RewriteEngine On

RewriteRule ^t(.*).html t$1 [L]
RewriteRule ^f(.*).html f$1 [L]
RewriteRule ^u(.*).html u$1 [L]
RewriteRule ^p(.*).html p$1 [L]
RewriteRule ^archive(.*).html archive.html [L]
RewriteRule ^Af(.*).html Af$1 [L]
RewriteRule ^At(.*).html index.php?page=topic_archive&show=1&id=$1 [L]
RewriteRule ^search(.*).html index.php?page=search&index=1 [L]
RewriteRule ^t(.*) t$1 [L]
RewriteRule ^sitemap.xml sitemap.xml
RewriteRule ^sitemap(.*).htm sitemap.htm [L]
RewriteRule ^(.*).html$ index.php?page=profile&show=1&username=$1 [NC,L]
</IfModule>