Search & Extract
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RTF & RTFD- Rich Text Format
On Mac OS X RTF has the same role as "Styled Text" had in Mac OS Classic. It is the main type of styled text you can copy and paste via the clipboard.
Applications which will save copied text and preserve style, can do this by saving the RTF, but they may choose to reformat the text with loss of styles.
"Stickies" use RTF in its file format. It stores its database in your Library filder under the name "StickiedDatabase". This is a private file format, but it contains each sticky note in its own chunk of RTF which File Juicer can extract.
Text clippings with "style" you drag from applications to your desktop, also contain RTF, which File Juicer can extract.
You can use TextEdit to convert a RTF file to ASCII text, if you don't need the styles.
One variant of rtf common on Mac OS X - "rtfd" stores images intact inside. File Juicer will extract those.