Convert Excel spreadsheet into a stand alone executable file.

Has anyone had any experience converting a spreadsheet into a standalone executable file.
I have a spreadsheet, which has numerous sheets, complex formulas and a considerable amount of VBA.

My aim is to make it available commercially so it really needs to have the feel of a standalone program - not just something someone has written in Excel.

A quick google search comes up with numerous alternatives, both free and expensive.

Can anyone offer any advice?

Thank you.

1) main macros and function put in your dll
2) rewrite your macros that functions refer to you dll
3) with InnoSetup make a utility installing in system you DLL
google COM Addin and look here: www.cpearson.com