http://madinstro.net/rg/VRTool_converter.xlsx
It produces two VRTool compatible pages that you can export to csv files. One is full size (every knot and every degree) and the other is much smaller but probably still good enough (every 5 knots and every 5 degrees).
The first tab ("polars") is where the work is done, there is a brief HOWTO that explains what to do in English, (but also in French so Antoine may also use it

Cheers,
John