Windows NT 3.1 build 404

Windows NT 3.1 build 404 is the March 1993 beta of Windows NT 3.1. This build now uses a setup that's closer to the one in the RTM. Alongside, new applications like Mail, Schedule+, and new Regedit have been added. This is the first build with a default color scheme based on the one in Windows 3.1 instead of Windows 3.0 like in the previous builds.

File differences
The following files have been introduced or removed compared to build 340: