Hi new update:
So I've opened the X1.dat wallet... and it synchronized and rescanned.
When it openend, everything was blank. No tx, nothing.
I did a dumpwallet command from console on that wallet file... seems when I open that resulting file, all the adresses it dumped are in Segwit. That's not what I needed at all.

How can I make it do a dumpwallet command on the Legacy adresses?

thanks for all the help so far, it got me going, I feel I'm getting closer