Bypassing quarantine with ADS formatted filenames

["Jack Cullen" <jack_cullen () hotmail com>]

Is it possible to get file attachments past AV software by using alternate 
data stream type filenames?
We have set McAfee GroupShield to quarantine all .zip files yet several 
people have received messages with .zip attachments that came in the 
following formats:

The attachment 'Informations.zip:Informations.txt'
-or-
The attachment 'sample01.zip:data.rtf                                        
                                   .scr'

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