To really be useful (to me at least and a handful of others I've talked to) it has to have xlsx support or at least open document format. If you're not sharing

To really be useful (to me at least and a handful of others I've talked to) it has to have xlsx support or at least open document format. If you're not sharing it with anyone then csv-only is fine, but still very limited. This project is early days though so shouldn't be judged for a while, but I would heavily suggest not overlooking compatiblity support even though it's a nasty boondoggle.