#Options +FollowSymLinks
RewriteEngine On

#RewriteRule ^w/index\.php\?title=(.*)$ /wiki/$1 [R,L]
#RewriteRule ^wiki/?(.*)$ /w/index.php?title=$1 [QSA,L]
RewriteRule ^wiki/(.*)$ /w/index.php?title=$1 [PT,L,QSA]