Current Xara Etreme 4:

1. Create a new XAR file
2. Import an image (or add something else to it)
3. Save it
4. Export as some type of graphic file
5. Close XAR file

Even though you have not modified anything between steps 3 to 5, Xara will prompt you to save upon step 5.

Please add change detection and refrain from showing superfluous dialog when nothing has changed.