Windows 98 build 1581.1

Windows 98 build 1581.1 is an interim build of Windows 98, which was originally shared on 11 September 1997 by the warez group SWAT.

Changes

 * Internet Explorer has been updated to version 4.01.
 * This is the first build to implement the IE4 easter egg, although it works by dragging the IE logo to the globe while holding the Shift key. This will open  (or "IE 4.0 ROCKS!"), which is a page not only showing the names of the developers, but also 18 "Nerd Features".
 * Microsoft Chat is now installed by default.
 * During the final part of setup, the window that shows Windows Help to prepare for the first use no longer pops up.
 * The "Internet" and "Users" Control Panel applets received new icons. The latter one is now identical to the RTM build.

System configuration
It is recommended to run this build in an emulator such as PCem or 86Box, otherwise you will encounter errors relating to Internet Explorer during the System Configuration portion of the setup. Should you encounter these errors, you must close them to continue, but note that many system applications will not work.