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 Control Panel and Windows NT Setup icons are now updated to match the ones in Windows 3.1. A version of the build in the Alpha AXP architecture was shared on 4 August 2020.

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