[Tracker] filters not working

[yelo_3 <yelo_3 yahoo it>]

Hello, I'm indexing with tracker a part on my windows partition with documents. So I wanted to skip the 
indexing of useless files such as
desktop.ini
thumbs.db

*.lnk

I've added them to 
NoIndexFileTypes=thumbs.db;desktop.ini;*.lnk;

I removed the directory containing the index, and rebuilt it, but tracker is still displaying and indexing 
those files!

Is this a bug, or the NoIndexFileTypes shall be used in another way?
Thanks




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