There are two options for export XAML
1. without Silverlight compatibile
2. Silverlight compatibile

I need without Silverlight compatibile, where is created viewbox, problem is, exported path have this structure:

when Silverlight compatibile is selected, then it export this way:
and I need path exported with this way. Is there options how to export without Silverlight compatibile and path exported with S. compatibile?

I just did a test. When I use File menu > Save As > XAML, after I click Save, Inkscape gives a very small dialog, asking Silverlight compatible (XAML) or not. It's a checkbox.

I'm using the current stable version 0.92.2

I don't think there are more options than the interface offers.
You could perhaps export to both formats, and then copy the viewbox (or whichever it is that you need) over from one format to the other.

If you would like to make a feature request, please visit:
https://bugs.launchpad.net/inkscape

There, make sure to thoroughly explain what you need (and also why you need it might help). I'm not sure I do understand which parts of the data bits you copied here are those that you want.

Thanks for answers,

You could perhaps export to both formats, and then copy the viewbox (or whichever it is that you need) over from one format to the other.

Yes, that is what I doing now.
What I need is save file as xaml but with paths like Silverlight compatibility. It is for GUI engine, where this kind of paths is needed, other paths are not rendered.