Hvad så med det her -
<< I have written a rather large application in VBA,
set up the menues and then I saved it as an XLA.
Now, I want to change those menues, but that is only possible
in an XLS.
How can I change back to XLS, without having to do the whole
program over again? >>
You can change the xla back to an xls in the VBE (værktøjslinjen Visual Basic) window. Select 
ThisWorkbook in the Project Explorer window and in the Properties window 
you can change IsAddin to False. You will now be able to view the Excel 
objects (Sheets, etc.) in the Excel window.