The Acer Computer Explorer (ACE Desktop) is a Windows shell made by Medius IV (http://www.medius-iv.com/) for Acer Computer Corporation. It was released only for Acer Aspire machines, with a primitive Windows 3.1 (version 1.x) and a Windows 9x version (up to version 4.01). The Windows 9x version features several folders on the left side of the screen, each of which opens in the main part of the window with many different program icons. This program runs in full screen mode, hiding novice users from the main Windows 95 interface. It also has an install feature similar to the Add Programs wizard for Win95, but with the addition of specific applications for the Aspire computer it was installed on. It comes with five themes: Fusion, Sandstone, Metallic, Photoreal, and Cartoon. The default style is Cartoon. It has built-in support for multiple users in Windows 95, as well as restricted access for certain users. The shell was used on most Acer Aspire systems sold through 1997.