Outlook 2010, force client to use local XML file for autodiscover settings

I need to force Outlook 2007 and 2010 clients to use a shared XML file for autodiscover settings. I was reading over this article for the necessary registry keys and steps:

http://technet.microsoft.com/en-us/library/cc837949(office.12).aspx

In this article, it shows the registry key to set up for the local XML path as this:

Key:

HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\AutoDiscover

DWORD: fourthcoffee.com

Registry type: REG_DWORD

Data: \\server1\share\autodiscover.xml

However, this registry key CANNOT be a dword, and contain a string value. My question is for the MS people or anyone that has deployed this, what type of registry key does this need to be? String, multi-string? TIA!

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