Thank you for your opinion.
We will make the following modification in the Application Close dialog: models that are open but have not been modified will not be selected to Save. So, there should be no confusion now.
We think it’s more comfortable for users to have all opened models listed in the Application Close window and decide what to do with them - whether to save changes or not, resave to another file etc.
Here, TDM 3 also warns you if you select a file to save that is already open in the application etc.
If you want to give people a chance to save things that they haven’t changed to some other location, the program should show the Application Close window every time the application closes regardless of whether anything has been changed.
I don’t think many users would appreciate it.