Hi, I have downloaded the latest version of TNEF Zip file and unzipped all of its contents. Now, I can't see any .exe or application executable file, so how am I suppose to use this to open the winmail.dat attachments ? PLEASE HELP.
TNEF is provided in source only. You will need to build the executable from the sources. Or you can find a distribution which provides you with the built executables (TNEF is provided built on various Linux distributions, by MacPorts for MacOSX and by Cygwin for Windows).
If you are going to build the sources yourself everything is all set up for you to run autoconf, configure and then make all. This assumes the typical GNU toolkit.