Someone on my Twitter feed reported that they'd lost the source code of a Twine game of theirs, and wanted to know if they could convert the HTML back to a usable format. So, I decided to quickly knock up a utility that could do that. Here it is - it extracts the passages from a HTML twine game and converts them to Twee source code, which Twine can import using the "Import Source Code" menu option. I hope it works for you.