Mine

# Use mod_rewrite to enable "Clean URLs" for a PmWiki installation.
RewriteEngine On
# Define the rewrite base.
RewriteBase /s/atd
# Send requests without parameters to pmwiki.php.
RewriteRule ^$           pmwiki.php  [L]
# Send requests for index.php to pmwiki.php.
RewriteRule ^index\.php$ pmwiki.php  [L]
# Send requests for index.htm to pmwiki.php.
RewriteRule ^index\.htm$ index.htm  [L]
# Send requests to pmwiki.php, appending the query string part.
RewriteRule ^([A-Z0-9\xa0-\xff].*)$ pmwiki.php?n=$1  [QSA,L]