The Qlikview version 11 Reference Manual states
QlikView 7.52 and later share the same file format as QlikView 11. Work in these versions in parallel virtually
without thinking about it. New QlikView 11 document features will of course not work in QlikView
7.52, 8, 9 or 10 but will be retained even if the document is opened and edited in the earlier version.
So you should be able to open qvw file created using v11 in v9, but you will not see the v11 features.