No :
Settings:
http://i.imgur.com/ZlhLA.png
http://i.imgur.com/qR3nm.png

data after the program starts.
data has changed, a new date on the files.
http://i.imgur.com/RgnYc.png

I open the program again, it shows that nothing has survived.
Do not close the program look at the data files ...

Why does function "write if not present" overwrite existing files, thus not allow the program to save the data?