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How to assign the default value to filefield

Project:FileField
Version:6.x-3.0
Component:Code
Category:support request
Priority:critical
Assigned:Unassigned
Status:active

Issue Summary

I create custom form including the filefield field, and I want to set the default value to filefield.
But I can not get the success result.
Is that possible? (And I can not load the form from node, since the form is not a node form)