History
New Executable made its first appearance in Windows 1.0 in 1985 and then was used in the multitasking European MS-DOS 4.0 in 1986, which falls between mainstream MS-DOS versions 3.2 and 3.3., and OS/2 in 1987. The target operating system field in the file header makes 01=OS/2 02=Windows 03=European MS-DOS 4.0 suggesting that OS/2 support was planned when this file format was developed, knowing that the Joint Development Agreement of IBM and Microsoft for OS/2 started in August 1985, a few months before Windows 1.0 was released in November 1985.
The Portable Executable format replaced NE format in 32-bit and 64-bit versions of Windows, while LX Linear Executables replaced NE for 32 bits programs in OS/2.
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