Blocking File attachments in Outlook 2010

When using GPO to block files from opening in Outlook 2010, does anyone know if Outlook is able to open ZIP files to see if the contents of the file contain files that should be blocked?  

Also, is outlook easily fooled if someone sends a blocked file type (such as an EXE file) but changes the extention (for example, to .TXT)?

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B HCommented:
outlook is absolutely fooled by renames yes... and the GPO/outlook do not block zipped exe's either

of course, the attachment won't directly open, the user will have to save it and then rename it (from virus.exe.bob to virus.exe, for example)

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