I have Vista and notepad++ 4.7.5

I have option to remember session. I have opened files: myfile1.txt, myfile2.txt

now I am closing notepad, deleting file myfile1.txt and then can't run notepad. there is error: can't find file myfile1.txt and next information that notepad stop working. to run notepad I need to create file with name myfile1.txt