Many years ago I wrote a tamagochi like virtual pet called "Virus" which lived as "name.virus" file in a folder and you could feed it text files with a ".food"

Many years ago I wrote a tamagochi like virtual pet called "Virus" which lived as "name.virus" file in a folder and you could feed it text files with a ".food" extension. Based on its DNA (random strings inside the".virus"file) it liked certain words more or less and had to eat quite a few files when it was Hungry It also left ".poop" files in the folder you had to clean up in order for it to stay healthy. Also added mating and offsprings which would fork the process so each would "live" their own life