Standalone app - persistent data.

I'm trying to develop a standalone app for a client that is sort of a store management software. It will control inventory, employees, schedule, etc. I feel that the best way to access this data would be using a relational database. Now, I have set up a successful connection to mySQL in this standalone app, but I don't want to have to install mySQL on any PC that wishes to use it. How can I go about embeding mySQL into the app? And how will the data be stored? Can it be in a custom file type (not in standard mySQL table files)? Is that even determineable by me?
Thanks

Well, the thing is, I want to make it as portable as possible. Isn't there a way I can embed mysql into the application? If not, is there a way a can keep the data access entirely within the application? Say where you "save" a file that contains the entire "store". You could copy that file to any other PC using the app and open it up. Kind of like a .xls or .doc file......

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