Windows 3.1 March 1991 build
| Build of Windows 3.1 | |
| OS family | 16-bit Windows |
|---|---|
| Version number | 3.1 |
| Architecture | x86 16-bit |
| Compiled on | 1991-03-20 |
The Windows 3.1 March 1991 build is an early build of Windows 3.1. Multiple system files from this build are used as the Windows-on-Windows compatibility layer in the Windows NT 3.1 April 1991 build.