How to get Pine/Thunderbird to correctly display various file formats?
You need a ~/.mailcap file in your home directory. This file contains lines pairing up content types with helper applications that know how to view them. Copy ~info/dot.files/.mailcap to your home directory. Currently, this will enable you to view Acrobat PDF files with acroread, postscript files with gv, and Word files with OpenOffice, from both Pine and from Thunderbird.