Hi Steve,
I've had success using the /XDF switch with GridView parameters using this syntax, as outlined in the the AOC reporting document from 2009 (page 102):
/XDF"*:{Filter name}" to use the filter name from all views in the workspace if available
/XDF"{View name}:{Filter name}" to use the filter for a specific view
multiple XDF switches are permitted to pick a specific filter for each view if desired.
/XDF"*:Sort by customer"
/XDF"OE-Orders:Outstanding items"
The view extension .gv is not needed. I think the documentation has a : after each of the /XDV or /XDW or /XDF examples and that may not be required.
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Regards,
Softrak Tech Support