Thank you very much, it's working now. Just for the record, when I used the command:
java -jar JabRef-3.8.2.jar -d all
e I got the following message from my prompt:
fev 14, 2017 10:28:33 AM java.util.prefs.WindowsPreferences
ADVERT-NCIA: Could not open/create prefs root node Software\JavaSoft\Prefs at root 0x80000002. Windows RegCreateKeyEx(...) returned error code 5.
Setting all preferences to default values.
I think it maybe worth saying that my W10 is in Brazilian Portuguese. I you want me to send some kind of log for some sort of debbuing, just let me know.