Block attachment types - Exchange 2007

We have one exchange 2007 server in our domain that I need to block certain attachment types.

When I run the following command, i get the following error: "Add-AttachmentFilterEntry -Name *.EXE -Type FileName"

ERROR:
The term 'Get-AttachmentFilerEntry' is not recognized as a cmdlet, function, orperable program, or script file.  Verify the term and try again.
At line:1 char:25
+Get-AttachmentFilterEntry

It appears that the 'get-attachmentfilterentry' is not a valid command.

I need to put a block on all .exe attachments.  How can I accomplish this?

cdubbciscoAsked:
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andrew_aj1Commented:
Check out this guide from microsoft:
http://technet.microsoft.com/en-us/library/aa997139.aspx
Hopefully it will help. Good luck.
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techneitsolutionsCommented:
Hi just tried with the command

Enable-TransportAgent -Identity "Attachment Filtering agent"

On SBS2011 but again I get an error:

[PS] C:\Windows\system32>Enable-TransportAgent -Identity "Attachment Filter Agent"
Transport agent "Attachment Filter Agent" isn't found.
Parameter name: Identity
    + CategoryInfo          : InvalidArgument: (:) [Enable-TransportAgent], ArgumentException
    + FullyQualifiedErrorId : 787F298B,Microsoft.Exchange.Management.AgentTasks.EnableTransportAgent
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