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Dear All,
I think that you can make it without hacking anythind.
You just have to go to Modules --> Extended Profiles --> Fields --> Add a Field.
Then give a Name to the Field, a Title (what you see) a description and choose the Type (e.g. Text Field). After submitting it, you see a new page where you can make it required and visible in the registration form.
Regarding the upgrade from previous versions, I would suggest a kind of "copying" the existing Real Name to the new Field.
I am sorry but I do not know how to do it (I am not a programmer) and I wish that somebody can help us.
BTW, have a look
at this example (First Name - Last Name) in registration form of XOOPS 2.2