Creating directory during component install

[KingOfSka]

Hi all,
i'm writing a component for joomla 1.5 , all seems to work well except that i don't understand how to create a directory in my component folder, during the component installation process, trough the component's xml file.
I saw that using

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<filename>dirname/file</filename>

would copy the file and create the directory, but in the installation packages i have 3 dir witouth files, and leaving

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<filename>dirname</filename>

won't do, anyone's got a suggestion ?