Sanderxpander
Actually there is Pro Convert by SSL and AATranslator, both of which convert between DAWs, but they are both paid software and have limited ProTools support (the former only goes up to 7).
While ProConvert may be limited to version 7 of PT for the PC, AATranslator on the other hand will read from version 5 of PT up to and including version 10 and probably version 11 (we haven't finalised testing of version 11 PTX files yet).
AATranslator will also read far more detail than ProConvert can from any version of PT.
I suspect that my understanding of the term 'limited' may differ somewhat
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