Hi,
you should be able to do it with MCX by pushing out a managed preference for com.apple.LaunchServices.plist
Set the preference on your management station through Get Info > Open With > Use this application to open all documents like this
then import the com.apple.LaunchServices.plist from your management station into the relevant groups in Workgroup Manager through the Details tab.
I have had some problems where even though the preference has been set it still gets ignored and I haven’t been able to track down why. So what I tend to do is to add it to the default user template in /System/Library/User Template/English.lproj/Library/Preferences/ which hasn’t failed for me yet.
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