jesse,
Please be a little more descriptive on your needs, A Quick Google gave me?
There are two kinds of files that Twine works with: story files, which are editable versions of your stories that you can only open with Twine, and output files, which are read-only versions that can be opened in a Web browser. While you write your story, you make changes to your story file, then check to see what the output file looks like. When you're done, you can post your output file to a Web site or e-mail it to others.
So what are you trying to do?
Get a new empty tiddlywiki and experiment.
Have you tried to import a twine file into tiddlywiki, or even simply open it in an editor and cut and paste into a tiddler?, try to drag and drop a file into tiddlywiki and see what happens.
I suspect hidden in your question is the desire by you to write in a twine format your own stories and this may be achieved in tiddlywiki, but then you are effectively proposing other markdown or markup language. There are other examples of this discussed in the forums such as for script writing.
Perhaps someone in the community has already explored twine files so let us see if they respond.
Tony