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Saving past data and repopulating it everytime you open the GUI is relatively simple. I am not so sure that I understand what you are asking about the .exe file. A simple way to save past info in GUI's is to write your data code in the function that initiates the GUI opening. You can do this by calling another function from that opening function and sending with it the array you are editing everyday and saving it to a localized file on your computer(probably excel). Everytime you enter a value it will be saved in that file and everytime you open the GUI that file will be opened and populate your matlab array. Hope this made sense.
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