I have looked some more into the issue. After having converted the XF0W2 zipped product to a “beam-dimap” file in S1TBX version 1.1.2, I was able to open this “dim” file with the image viewer in the gui of S1TBX 2.07. Hence, the problem must have something to do with the productreader of the newer S1TBX version.
I have tried to convert the product in S1TBX 2.07 to “dim”, but this was not completely successful. It only converted part of the product and aborted with the same error as mentioned before.