RTFD文件是文本文件,提供包含PDF文件,其他文件和文檔或圖片附件的支持。這些文本文件在RTFD擴展基本上具有相同的支持和RTF文檔的功能,但通常被稱為富文本文檔目錄的文件。最初,RTFD格式技術被用於下一代操作系統版本開發的,而今天,Mac OS X提供這些RTFD文件的更多支持。在Mac OS X,用戶可以打開和查看在右鍵菜單中選擇“顯示包內容”連接到這些RTFD文件的內容,而這些附件大多是添加到一個RTF文檔的其他文件。
Apple TextEdit is a text editor program and an open-source word processor too, which is first used in NeXTSTEP and OPENSTEP, but now integrated in most recent versions of Mac OS X. It is also considered a GNUstep application for other operating systems that are Unix based, like Linux computers. This program is operated by Advanced Typography by Apple so expect several advanced typography related features. The main function of this software is to read and write documents in plain text, HTML formats, Rich Text Format, and Rich Text Format Directory. It can also open Simple Text files but does not have the capability to save documents of that format. Mac OS X version 10.3 supports Microsoft Word documents, while Mac OS X version 10.4 can open and save Word documents in XML file. Mac OS X version 10.5 is able to read and write Office Open XML as well as OpenDocument Text. Features included on TextEdit are formatted text support, addition of graphics, animations and other multi-media contents, automatic adjustment of letter spacing, as well as reading and writing support of character encodings.