i don't know why spreadsheet applications don't standardise on a file extension that they won't screw with. call it csf or something. treat it like pure CSV except don't interpret =/@ or any of the other weirdness. basically just interpret all fields as plain strings as default [even if they look like numbers]. this way everything is backwards compatible old 'weird CSV' files still work and those that care about their users can use .csf and the files won't endanger their users.