I've some BTC stuck on this wallet, it's earlier version that is being discussed though - version 2.46.

There is no option to backup the wallet, but there is an option to backup the keys.

I have done that, exported the file and have it on the computer. None of the described methods are working though, they are all falling down at the decryption of the wallet stage (presumably because I do not have a back-up of the wallet but a backup of the keys only).

My file is formatted bitcoin-wallet-keys-YYYY-MM-DD. When opened in a notepad file is just 5 lines of mumbo jumbo. Electrum does not recognise it as anything, so I presume it's encrypted.

Any ideas?!