1 - backup wallet.dat 2 - copy wallet.dat into new xc3 data directory 3 - run xc3, you will receive a warning about keys 4 - check to see if you have the privatekeys from old wallet
If you get this message :
"Warning: error reading wallet.dat! All keys read correctly, but transaction data or address book entries might be missing or incorrect."
then your allset, if you get :
"wallet.dat corrupt salvage failed"
Use command dumpprivkey adressname in the old XC wallet to get the private key.
Use importprivkey with that key in the new XC wallet.