New source problem in Dev c++

Hi,
I would like to ask help on this:
I use Dev c++. When I add a new source file to the project ("Project"->"Add to project") it works properly and I can build the .exe. But after restating the Devcpp it forgets that new file and it has to be added again. Where am I wrong?
("Save all" does not help.)
Best regards,
Jfekete
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