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The software of windows NT 3.1, 3.5, 3.51 and 4.0, is possible to install in windows 95 and 98?
Yes, i know, i asked a question like this, but i have software of windows NT 4.0, and i wanna know if i can install it in win 98 or 95, i like NT(until the version 4.0) but i don't know if is possible install programs of NT on 9X
The vast majority of application software at the time was designed for Windows 95 and Windows 98, and was also designed to be compatible with Windows NT 4 (i386 version).
Remember, Windows 95 and 98 were the more common desktops operating systems at the time. Windows NT was primarily used on high-end workstations and servers.
(Conversely, as you asked, if an application program runs on NT 4 or 3.51, it will probably run on 95/98/ME)
There are a few exceptions, of course. Any system level program that requires a .VXD/.386 driver will not run on NT. A program that makes use of NT specific APIs, such as NT network control stuff, will not run on 9x.
Both Win9x and NT support running well behaved Windows 3.1 16-bit applications. Some vendors chose just to stick with that.
edited August 2020
Like SomeGuy said, most "regular" programs (meaning no drivers and such) should work. The Win32 API in Windows 9x is a subset of the one from NT.
edited September 2020
I remember when I was development, we had to combat DLL hell that all of these OS's are effected by.
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