DEVONthink supports already a multitude of file formats from plain text to Markdown and PDF. For everything else it uses the available Spotlight metadata importers to extract text for its full-text index. Quick Look helps it to display a file’s contents on the screen.
The true beauty of Spotlight and Quick Look lies in their plugin architecture. If there’s a plugin for a file format the system can search and preview it. And so can also DEVONthink.
We have now made a short list of useful plugins available on our Download Extras & Manuals page. Check it out and let DEVONthink learn a few more tricks for free.