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Exchange 2010 - Blocked attachments in OWA

I am finding attachments of the type .dtd are being blocked when viewing messages in OWA 2010  (in Outlook 2010 they display OK). They are design school software files.

I think I need to use the Set-AttachmentFilterListConfig but this command is not recognised. Maybe it needs the edge transport role on my server to be installed. I dont know if that role is installed.

so 2 questions:
How can I tell if edge transport role is installed
How can I unblock this attachment type?

Any specific powerhsell command would be grategully accepted!
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Pete
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Pete
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scriven_jCommented:
If they are coming through in Outlook 2010, then it is not an Exchange thing as such.

Check out the registry keys listed in this article and look for the .dtd file:-

http://searchexchange.techtarget.com/tip/How-to-configure-attachment-blocking-in-Outlook-Web-Access

Post back here is this is not clear or you need more specific instructions.
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scriven_jCommented:
P.S. This would need to be on your CAS server (which is the server that hosts OWA).
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scriven_jCommented:
Sorry - I have just checked and that key no longer appears in Exchange 2010.

Have a look at this related question:-

http://www.experts-exchange.com/Software/Office_Productivity/Office_Suites/MS_Office/Q_27454509.html

It includes the powershell.
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PeteAuthor Commented:
I only have a single Exchange 2010 server.

The reg key below dos not exist

HKLM\System\CurrentControlSet\Services\MSExchangeWeb\OWA\Level1FileTypes

doing a search in the entire registry for 'Level1FileTypes' show no results.
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scriven_jCommented:
Our posts crossed.  That key is no longer used in Exchange 2010.  Please see the link in my previous comment.
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PeteAuthor Commented:
awesome works a treat, thanks.
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