How to register a new extension using QuickLook on Mac OS 10.7?

Question

I really like the QuickLook feature in Mac Finder and often use it to view text files without opening them in an editor. I work with several types of files, which are text files, but have extensions that QuickLook does not recognize.

How do I tell QuickLook that files with various extensions (.rst, .aux, etc.) are plain text and can be viewed as .txt files?

I saw hacking solutions that were valid in 10.5 and 10.6, but looking at it, it seems that 10.7 handles things differently.

Answer 1

There is a project https://github.com/bigkm/qlplaintext that provides a partial solution that is very useful. It allows QuickLook with a space, but not a preview icon.