Here is a curiousity question. I have an application that must support both flat files and the database as a place to persist data. I was thinking maybe using a .csv or ta
Try using the Jet engine (see this)
Dialect and other nhibernate settings should be the ones for Microsoft Access.
No not to the best of my knowledge. I have the same requirement and have ended up just using flat XML files and hand rolling all the CRUD.
Just today I did happen to notice this File System Database on codeplex but haven't looked into it properly yet.