Wow!!
I got a whim last night that it would be useful to have a backup of certain txt chains and found this app. It was late at night and the moment I bought the app I hit what I thought was a wall because it wanted me to do a back up to iTunes before doing anything and I use iCloud for backup. I emailed the developer and went to bed only to wake up this morning to a text from him he had sent immediately last night. I texted back early this morning saying I would try this later and he texted back immediately again. Later when I had time to work on it he was still readily available and walked me through exactly what I needed to make the app work properly on a PC. The app is as useful as I had hoped to but the tech-support was truly impressive.
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Export Messages - Save Print Backup Recover Text SMS iMessages, v1.1