Handling secure media items in extranet for Sitecore 6?
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I have setup an Extranet on a Sitecore solution. Login and access to the items below the extranet works fine with security etc.

But there is also files, that should onyl be accessible to users that have logged in to the Extranet. For this i have made a folder in the root of the media-library called "Extranet". I have set the security on this (added the extranet\user and removed read access from extranet\everyone). I have also checked the inheritance option in the security field.
But when i add a file below this folder, it does not look like it enherits the security settings. Although extranet\anonomys cannot access the item, extranet\user cannot either. If i explicit set the security on the file and allow extranet\user, it works. What could i be missing?