How can I get the private key from wallet.dat from 2011 Bitcoin software on WinXP?
The wallet.dat was created with Bitcoin Core (in 2011 it was called "Bitcoin").

You should install the newest version of Bitcoin-Core (0.14.2 by the time of writing). The wallet.dat from 2011 should still run.

Use the GUI.

If you want to export the private key, you don't need to sync (takes a couple of hours / days)

Can also be done on a different machine then your Windows XP box.

Following steps may help:


Start Bitcoin Core
Stop Bitcoin Core
Datadir should be created, open the datadir folder (https://en.bitcoin.it/wiki/Data_directory)
Replace the existing wallet.dat (backup it if you already had Bitcoin Core installed) with your old wallet
Start Bitcoin Core
If you want to export your keys, open the debug console and type dumpwallet &lt;filename&gt;
If you want to use Bitcoin Core, let it sync (takes a couple of hours/days)