This has to do with the settings on your computer. The following guide is for Mac users only.
- Make sure your Dock is visible. 
- Select your .csv file in the Finder. 
- Grab it with your mouse and move it over the Excel icon in the Dock. Do not release the mouse button. 
- Hold the Command and Alt keys on your keyboard. 
- Release the mouse button. 
Another option is to set Excel as the default program to open CSV at all times:
- Right-click on a CSV file. 
- Click "Get Info" in the dropdown menu. 
- Click "Open With" if that section isn't already expanded. 
- Choose Excel from the dropdown menu. 
- Click "Change All..." 
- Click "Continue" when the Finder asks you if you're sure. Now any time you open a CSV file, the Finder will automatically open it with Excel. 
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