Its definitely coming along nicely
Anyway, suggestions:
- Currently open filename in the titlebar
- Moving that textbox when no buttons shown (^what Ezra said)
- Confirm Exit/Warn about unsaved changes on exit
- Update check - I know you're trying to implement this but I'll post here anyway
- I know it wouldnt be easy, but maybe a recent files submenu somewhere perhaps?
And I'll edit if I think of more etc.