Peter, to rename a Tawe click on the file name at the bottom centre of the screen when you have the project open and this will rename it. If you export and change the filename this just renames the packaged file and not the project name in the content of that file so you need to name them in the application itself.
Many thanks; hadn't spotted this. P
I have created a Tawe file and have exported, saved and published it. Nowhere have I been able to change the name of the file from Untitled. When exporting I gave the file a name but when I imported that file it appeared as 'untitled' again. What am I missing?