Sometime ago with previous versions of NS I was able to save results with the same name in different formats now that's only possible using different name for later renaming.
This is what I do:
1) Open save as results windows
2) Write a file name then choose xml files
3) Press save button (Same behavior as previous)
4) Now the different - Open again save as results windows
5) Select the previous saved file (No need to write again the same name)
6) Pick another format - This time csv files
7) Press save button - Then a message to overwrite the previous saved xml file - In previous versions NS save the file in the selected format without problem.
Thanks in advance for your concern to this matters.