Oldest programs you use

What is the oldest program on your computer?

Classic Unix utilities and DOS games do not count.  I mean programs that you still use on a regular basis and that still have some utility or amusement to you.

I still use iPhoto Plus! 4, an old program that came with my since-dead EPP scanner.  While not full featured, it's fast.

Classic Unix utilities and DOS games do not count.  I mean programs that you still use on a regular basis and that still have some utility or amusement to you.

Erm wut??

Classic unix utilities still have much utility, I still fallout and doom are still my favorite games (not much of a gamer)