Extra.dat is a special, not yet fully tested, .dat file. It is intended for testing or emergency release of a specialized signature file prior to the next regularly scheduled release.
You do not need and I would not recommend, configuring Extra.Dat within Installation Designer.
Within McAfee Installation Designer (v8.7) one could use the Extra.Dat field to set up an ePO installation for emergency distribution within a network. However, if this is not your intent, I would simply ignore this part of Installation Designer.
Hope this helps. Ron Metzger
Thanks, Ron Metzger
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