ijk

Just to follow up, I’ve found some of the answers here
http://iamtgc.com/2007/06/02/definitive-guide-to-wordpress-rewrites/

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
# Custom rules need to go here
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

And for urls such as the above custom.php?link=20061031 need rewrite rules like this

RewriteCond %{query_string} ^link=20061031$
RewriteRule ^custom\.php$ /2007/10/31/entry-name? [R=301,L]