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Allow rar, zip extensions in MS ForeFront

Hi every time I want to send or receive rar file i get this message in email:


Microsoft Forefront Security for Exchange Server removed a file since it was found to match a filter.
File name:
Filter name: "FILE FILTER= unnamed: *.rar"

I have tried to configure the filter in MS ForeFront but with no luck. Can someone tell me how to do it.
1 Solution
this article refers to Filefront Beta 2 - but I'm betting that the same concepts hold for the street release

Configuring and using the E-Mail protection feature in Microsoft Forefront Threat Management Gateway Beta 2 (Part 2)
I have the same problem, I tried to follow this istruciotn in thi microsoft articles, but form me it doesn't work:

Excluding the contents of a container file from file filtering
To exclude the contents of a .zip (container file) from being scanned for filter matches, specify the name of the .zip file in the file filter list and set the action to Skip. Ordering of the filter in the list is not important. If the name of the .zip file is in the file filter list and its action is set to Skip, its contents are not scanned by the file filters. The file is, however, scanned for viruses. If you would like to skip all .zip files, create the filter: *.zip and set the action to Skip.

By default, this functionality only applies to .zip and .jar files. If you would like to enable this functionality for other archive types (TAR, GZIP, RAR, Macintosh, SMIME, and Self-Extracting .zip archives), you can set the following DWORD registry values:
Realtime Scan Job   SkipFileFilterWithinCompressedRealtime
Manual Scan Job   SkipFileFilterWithinCompressedManual
Transport Scan Job   SkipFileFilterWithinCompressedInternet
For the location of these registry keys, see Registry keys. After creating each registry value, it should be set to 1 to enable file filtering in the specified archive types.

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