Open the twb file into notepad and change 10 into 9.3 and open it in 9.3.
I tried that and an error message comes up "an error occurred while communicating with data source 'Sample - APAC Superstore".
I didn't use any features that's only available in v10 and had used the dataset from My Tableau Repository in v9.3. Do you know of any other way?
Try to change data source available in your system and test it.