Encarta might have been one of my first experiences doinking around with computers - I remember replacing the .WAV file for a cheetah with the sound of a car's

Encarta might have been one of my first experiences doinking around with computers - I remember replacing the .WAV file for a cheetah with the sound of a car's engine and trying (but failing) to convince my brother it was the REAL sound of a cheetah. There is something about the data being bounded and explorable, both through the software and the file system that was... neat.