[Inkscape-user] Can't get inkscape --export-area to work on windows

I am using inkscape in batch mode to convert SVG images to PNG. On Linux it works perfectly.

On Windows it works ... until I try using --export-area. Whenever I give --export-area parameter, inkscape silently does nothing.

I suspected locale settings but even without fractional parts it does not work...

Has anybody succeeded at using inkscape in such way on win? What can be the trick?