Updating a Word 2003 Custom Property via Reflection

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I am able to search through custom properties of a Microsoft Word 2003 file.
I have yet to figure out the call to update a custom property. I receive a
System.Reflecti on.TargetInvoca tionException when trying to 'SetProperty' on a
"Value".

Is there a code sample showing how to update, NOT add, an OLE custom
property in a Microsoft Word 2003 file?

Thanks.