Yes you need a RewriteRule as mentioned in the Admin Help (or it should be anyway).
It really depends on your particular settings but for example, we use:
Code:
RewriteCond %{DOCUMENT_ROOT}/vault/$1 -f [OR]
RewriteCond %{DOCUMENT_ROOT}/vault/$1 -d
RewriteRule ^vault/(.*)$ vault/$1 [L,QSA,S=1]
RewriteRule ^vault/(.*)$ showwiki.php?egg=$1 [L,QSA]
RewriteRule ^vault.php(.*)$ showwiki.php$1 [L,QSA]
Of course those RewriteConds are only necessary if you are using a folder that also serves real files. For most purposes, the two Rules at the end should be sufficient.
Be sure that your Wiki PHP file and Title Variable settings match your settings in .htaccess.
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