Can I export a gamebook/textadventure in to an exe file. If so, how can I do this?

The only way I can think to do it is to use the JS converter to generate Javascript, and then use webkit to package that up into an exe. The main problem with that is that JS converter doesn't seem to convert things very well (judging from what I have seen of people who have tried it and my own experiments).

In other words - probably not.