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CSV export is for Numbers users, I think. Apple has failed to support OpenDocument Spreadsheets, and their XLS importer regularly crashes altogether for the op

CSV export is for Numbers users, I think. Apple has failed to support OpenDocument Spreadsheets, and their XLS importer regularly crashes altogether for the operations people at my office, though maybe it's super stable elsewhere.

Someone 12y ago
In my experience, Numbers doesn't even import XLS anymore. XLSX works fine, though (for the features that Numbers supports)