How to do the Save As option in unity exe file

Hi,

I am working on a project there i have a save as option, i export the project as a .exe file, after export the project i need to add the option called the save as, where we can save the copy of that project and we can open it and play.

When i open the exe again i will generate the two buttons first one is my default project and another one is save as project what i have saved previously. This process will repeat every time when they do the save as option.

My question is how can i save that scene copy in .exe file.

Is this possible in unity?
If its possible can you please tell me how to do this?

Thanks.

any ideas?