I have Adobe Acrobat Standard as the default PDF reader. I PDF printed a page from a website. Then I clicked to open the PDF. After I finished viewing the file, I closed the window. Adobe Acrobat prompts me to save: Yes, No, Cancel. Since I changed absolutly nothing, I am puzzled why Adobe Acrobat's save dialog thinks there are changes and askes me whether I want to save the changes.
I have repeated opening and closing the PDFseveral times.
Then, I tried opening and closing another PDF, and it just closes without prompting to save.
Why do I get different behaviors on different PDFs? And can I control the behavior to get or not get the save prompt when there are no changes?