Windows NT 3.1 build 438

Windows NT 3.1 build 438.1 is the April 1993 beta of Windows NT 3.1. It's not that different from build 404.1, which was released a month earlier. The default desktop wallpaper still says "Beta - March 1993", but the Control Panel and Windows NT Setup icons are now updated to match the ones in Windows 3.1. This build was leaked in the Alpha AXP architecture on 4 August 2020.

File differences
The following files have been introduced or removed compared to build 404: