Years ago I used bitcoin-qt.exe and for a while would run it and let it update/download the blockchain in order to send any BTC. I had not done so for a very long time, and recently tried firing it up again but it was unable to fully update the blockhain, giving an i/o error or some such. Sence it was borked, I nuked the blockchain files to get some HDD space back. I have saved (from the distant past) my bitcoin_wallet_encrypted.dat. I was assuming I could import this into some new service/application, but I'm not finding any ability to do so. How can I get myself back access to my BTC?