Yeah, it's an Excel-specific thing, it appears. The thing is, it's perfectly valid (and not a bad idea) to place quotations around each cell's data in a CSV file. It's only necessary if the data contains a comma, because without the quotes the comma would confuse the column separation. For efficiency's sake (and human legibility), the quotes are only used when necessary. I've changed all of the export code to always use quotes for the first line of the file, thus eliminating the issue without affecting anything else.