There is a good reason why columns have quotes around them, and that's because there's no guarantee that the cell delimiter won't be part of a data cell (for instance, if your delimiter is a comma and you're exporting numbers formatted for some European culture, whose decimal point is actually a decimal comma).
However, you can still get rid of the quotes very easily. Instead of exporting directly to a FileStream, export to a MemoryStream, read that into a string, strip all quotes, then save the resulting string in the FileStream. It is a little roundabout, I know, but we do not plan to allow exporting without quotes.
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