Hi and Welcome. My Name is XXXXX XXXXX I look forward to assisting you today with your question.
It seems like that website only supports Windows (or DOS) CSV format. That means there is no way to use your Mac OS X to use those CSV formats. Remember, Macintosh's CSV is very different from Windows or DOS's CSV. Let me explain, If you have certain characters on the CSV, the encoding of those characters is entirely different on Mac OS X compared to Windows. In Windows, the CSV fields are encoded using Windows-1252 code page. DOS encoding usually uses code page 43 and the Mac uses UTF encoding, I think.
Anyway, back to your question. You have to install Windows on your Mac to solve this issue. You can install either Windows 7 or Windows 8 on your Mac. IMO Windows 7 is better than Windows 8.
There are two ways to install Windows on your Mac. You can install Microsoft Windows 7 with the help of VMWare applications like Parallels/VMWare Fusion OR with Apple Bootcamp.
BootCamp installs Windows on Mac directly by partitioning the Hard Disk. You can't use Mac OS X and Windows at the same time. To switch between Windows or Mac, you have to restart and select Windows OS or Mac OS X partition to boot into it to.
If you installed Windows on your Mac using the Parallels or VMware appplication, then you can load Windows by opening that application. With Parallels you can run Windows and Mac OS at the same time. The best advantage is, you don't need to restart your Mac to switch between the Windows and Mac. Both can be run at same time.
I think it'd be better to install Windows on your Mac using Parallels or VMWare Fusion. Either buy Parallels or VMWare Fusion.
Buy either Parallels or VMWare, then you have to buy Microsoft Windows. Windows 8 is the latest, but I think Windows 7 is better Windows 8 as it is more simple to use. (You have to buy Windows even if you want to use with Bootcamp)
Buy Windows as discs instead of downloading online as that'd better because you can install Windows easily using discs.
Installing Windows with Parallels or VMWare is pretty easy. Open that application and follow the onscreen instructions.
If you have any questions or would need any further help, please don't hesitat to ask and I will be happy to follow up with you.