I am unable to make any edits to one of my existing workflows after updating to 10.1. I no longer have the file format option of excel legacy so i can not set output option to to delete data and append, any existing tool that was set up with this format errors out when I try to run and if i change it to the overwrite option it errors as well. is there a previous version i can revert to that will bring back the legacy option in my output tools?