Programming examples from the book.
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If you backed up your entire keystore folder, pull out the text document inside beginning with name "UTC...." If you don't have the text file, only your private key, paste your private key into a text file and save it with any name. In either case: Drop this file it into the Keystore folder in your Mist wallet account data directory. You can find this directory by selecting the Backup... option in the Mist File menu. A window will open showing your keystore folder.