I don't know if this is even supposed to work at all, but anyway, the result was unexpected:
I had a site I made with DWB. Then I decided to use a Genesis theme with Extender, so I exported all the settings while DWB was still active, and imported them later with the import option in the Extender plugin. What I got were hooks, functions, labels and conditionals from something like two years ago!
I then opened the export file in a text editor and everything was as should, all the settings from the current site. Somehow during the import this file was not used but some data still present in the database? Is that even possible?