>You can get Streams utility and run it with -d command-line switch for the file you want to unlock. It'll wipe out all alternate data streams from the file including the one responsible for Unblock button.
>
>>
>>When I receive an XML attachment via Email and save it to a file the file is 'blocked'.
>>If, for example, I open it in IE then I see the nested XML tags but cannot expand/collapse the nodes.
>>If I look at the properties of the file in question at the bottom of the 'General' page it states:
>>"This file came from another computer and might be blocked to help protect this computer"
>>
>>Question: How to "Unblock" such a file programmatically ?

Thanks Sergey.

That will work for me - but I'll probably need to also do this on client sites as well so I'm hoping to find a way of doing this via Windows API (looks like it might be in shdovw.dll?)

Regards,
Viv