There are 2 agenda executable files 1 is a pif and 1 is a file that is not a exe,com or batch or pif. I have seen that kind of file before though. It is often given to information files that are not text. I am pretty sure i ran this thing before on an older computer. I don't have dos on my machine.
As i don't really like to give direct links go to wikipedia and search lotus agenda and 1 of the links will bring you to a freeware download of lotus agenda 2.0. Someone else try to get it to run and if someone gets it running tell me what you did as i cannot run this thing with dosbox as it only supports exe,com and batch files. You can also download it at classicgaming.com/ascii Which acording to the site owner only puts freeware orshareware games on the site. They have zork but that was freeware but is now not freeware i guess the site owner does not know about that.