[citation needed] Note that many applications were developed in conjunction with other reputable software and reference companies.

Most of these products were released on CD-ROM, giving the software the ability to display high-resolution graphics and animations, and play high-quality waveforms and MIDI files.

In the early 1990s, games on personal computers generally ran on the now obsolete MS-DOS operating system.

[3] For example, Microsoft Windows Entertainment Pack Games have remained a classic for computer gamers, ever since their development in the early 1990s.

Their products feature a purple-skinned character named McZee who wears wacky attire and leads children through the fictional town of Imaginopolis, where each building or room is a unique interface to a different part of the software.