I think this may be also due to change in the file data structure (starting from 2015 it is no longer a compound storage). And depending how XYplorer extracts the preview - this may be a reason of fail.
What is the previous supported version (2015 or older?). Can you try to put 2014, 2015 and 2016 file. Can you see the preview for 2014?
Thank you Artem for your response, I have forwarded the information on to the vendor.
I have also confirmed that the preview is disabled for all SW files regardless of age.
Has this ever been resolved? I have the same issue.