Convert MS Excel file to standalone

We have a relatively simple microsoft excel program that is used by **athletic coaches and we want to convert it into a standalone executable** that runs on **window** and **mac platforms**. Then we have a bigger market to sell the software. We have already sold a few hundred copies. The excel is quite simple, it contains a few buttons that pop up different sheets, and does a few calculations on column data. We can provide the excel file and a sample data set that comes with it. We would like for new user to be able to easily load in their own data. We are not sure about how this rentacoder process will work, so this is mostly a trial. If you do a good job converting the excel, then we will use you *exclusively* to make a long set of enhancements to the application and also to embed video. We would like to embed video that shows specific training exercises for example. We have a long list of other projects, but we are not software experts. So we need your help.