Because I am not a big Micorsoft person my Excel is only 2003. I know, I know, I should upgrade. But my Mac Numbers program didn't like it either. However, I went to the file that you noted and changed semi-colon to comma and it worked. I now have columns. Just a suggestion, you might want to consider having something in configurations to allow people to pick what they want as a separator.
Something too, How do I get the names addresses, city, and stuff on this Excel order table? It might be a good idea to have this on. I know you have two or more tables working together to pull this stuff. I have another Joomla component that I might use for this to get all the info together. What tables hold what? Which one is the billing address details, and which one orders? Also which column joins the two or more if I make a LEFT JOIN for my SQL.