That might work as well. However this method uses Bitcoinj which is also used by Bitcoin Wallet for Android.
Extracting privates from different client will always depend on its client itself. They have their own step on how to export private keys depending their formats, if not private keys its the recovery seed rather, and there's a tool for converting from recovery seed to private keys just simply as that.
I have edited the post so that you can also extract the seed.
Can you do any of this on Windows? isn't there a simpler way to do it?
Thanks!
I don't use Windows. However you can download VMware Workstation Player for free and install Debian as a virtual machine. It's very easy and will only take about 10 minutes.
Bit of a Newbie - at step 2 I get "unable to locate package openjfx". I am running Debian on Oracle Virtualbox. Any ideas please? Thanks.
Do you use an older version of Debian?