Hi,
I had wondered this for a while too as it is quite annoying that they can't be kept in version control. I had another look and I think I found where they are stored in the database.
If you connect to the DB (mine was localhost on port 3306) with the user name 'root' and password you specified when you installed.
Then select the database called 'adobe' and look at the table tb_sc_service_configuration you can see the XML in the descriptor field.
Locally they are stored here:
C:\Users\<username>\Workbench 6\forms\<projectname>\1.0\processes