I assume you're trying to open it in Excel so you can set up a historical league from Gambo's instructions?
A CSV file is just a comma-delimited text file, which you should be able to open up in any text editor. So if you don't want to bother with OpenOffice, you can always just use WordPad or Notepad (both of which come with Windows) to open the file.
Notepad, however, may balk at the file's size - if that's the case, you can use something like
EditPad Lite, which is also free, much smaller than OpenOffice, and can handle big files.