Probably my question should be „which file format has the best support“, so people would know which one should use.
I tried the DXF too... I got three concentric circles with with different colour, they are displayed as one colour. At least they were still concentrical.
In SVG they kept their colours, but they were not concentric.
I think in the wiki it shall be stated, that fpvectorial is not yet ready for practical needs, what do you think?
Its development needs to support.
There is no doubt about that.