Txtexp (text explode) express tool works without any issues on my old windows 7 machine. On my new windows 8 machine the txtexp command only mirrors the text. I have both 2014 and 2015 AutoCAD on both machines and the effect is the same regardless of version.
As I was typing this a thought occurred to me and it turned out to be the solution, so I will share it for the benefit of others. AutoCAD needs to be run as an administrator in order for this command to work. I would imagine that this has to do with the command using the wmfout and wmfin commands to extract the text.
Hope this helps,
B