Detailer Text is one of Poser 5's import and export options. The manual, not surprisingly, doesn't explain what it is. A google search pointed to Poser rather than to a file format. I did find out that it was dropped from Poser 7, which bothered one poster in the CP forum.

Does anybody know what this format is?

My visual indexes of Poser content are at http://www.sharecg.com/pf/rgagnon