del-dontcache seems not to work

Hello,

I found out that there are many files in my cache that I don't want to
cache. They are configured not to be cached, however they stay in the
cache even if I have del-dontcache set to yes:

DontCache
{        
...
        ~*://*/*.ps
...
}

Purge
{
...
        del-dontcache   = yes
}

However, even after I reconfigured wwwoffle and purged the cache (wwwoffle
-config ; wwwoffle -purge), I still see this file in the cache:

root@work# ls -l ?meHtVRfYlBeq7Xpwh9eM4A                 
-rw-r--r--  1 proxy proxy 60817 Apr 30  2004 DmeHtVRfYlBeq7Xpwh9eM4A
-rw-r--r--  1 proxy proxy    44 Apr 30  2004 UmeHtVRfYlBeq7Xpwh9eM4A

root@work# cat UmeHtVRfYlBeq7Xpwh9eM4A
http://www.root.cz/photos/latex/doc.proof.ps

Where's the problem, wrong configuration (did I read the case-sensitivity note
right?) or a bug in purging code?

I have wwwoffle from debian testing distribution, version 2.8c
Thank you.
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