Windows 1.0/Development Release 4

From BetaArchive Wiki
Development Release #4
Kernel version 1.0
CPU architecture x86 (16-bit)
Compile date August 31st, 1984

Development Release #4 is a pre-release build of Microsoft Windows 1.0. It was compiled in late August 1984. Images of the disks and the release notes were shared by member Allosgroup on July 8th, 2021.[1]

It is the last build to use the .MOD extension as the main executable format.