[pmwiki-users] Having difficult with .htaccess files

[phenotype]

Hi folks,

I'm new to PmWiki, and I've been really happy with how good it looks  
and how easy it's been to configure (especially compared to the awful  
experience I had with trying to install phpWiki), but for some reason  
I can't get pretty URLs using .htaccess files calling mod_rewrite. I  
know mod_rewrite is enabled and is working, because I have a  
WordPress install that has pretty permalinks (also, I edited the  
httpd.conf to turn on .htaccess myself) but whenever I use the  
example .htaccess files from the PmWiki site, I just get dumped back  
to the directory listing. I can access the pmwiki.php file from  
there, and the URLs display like they should be, but clicking on them  
gives me a 404 error every time. I'm totally stumped!

This is the .htaccess file I'm using right now:

# Use mod_rewrite to enable "Clean URLs" for a PmWiki installation.
RewriteEngine On
# Define the rewrite base.
RewriteBase /wiki
# 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 to pmwiki.php, appending the query string part.
RewriteRule ^([^/a-z].*) pmwiki.php?n=$1  [QSA,L]

The /wiki directory is in my site root (/var/www/html/), and I want  
the wiki to appear at the /wiki directory, as you can tell.

I'm running Apache 2.0 on a Fedora Core 2 based box, and it has PHP  
4.3.11 installed on it.

Thanks so much for your help!