ODTをRTFに変換
OpenDocument形式のファイルをRTFに変換すれば、古いエディタとの互換性も万全になります。
変換元
To
ODT
The OpenDocument text format used by LibreOffice and OpenOffice — an open standard for editable documents.
RTF
Rich Text Format — a simple document format with basic styling that nearly every word processor can open.