It is notpossible to open a file which has been promoted to 9.1 in Revit 9.
You will have to resort to a backup file that is still in Revit 9.0.
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Jeff Hanson
Autodesk - Technical Publications
Building Solutions Division
Manchester, NH
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wrote in message news:5491672@discussion.autodesk.com...
Does anyone know how I can open my Revit drawing from 9.1 to version 9. It
gives me an error message.