> just write a new file you export data to be shared with someone else. There's no good way to distinguish. Add separate File/Export command? Users will forget

> just write a new file you export data to be shared with someone else. There's no good way to distinguish. Add separate File/Export command? Users will forget to use it. Add a checkbox on file dialog? Similarly, users will forget to check it. It's very unreliable. The only reliable way is treat every save as "export data to be shared with someone else". > proprietary file formats Very few left, the industry has moved towards open formats. For example, MS Word documents are zipped XMLs, ISO/IEC 29500.