Microsoft veteran Raymond Chen decided to use three divisions. Interfaces for Windows 95 users have not yet been updated to minimize code. For this reason, it is clear that this is the reason for the lack of information. The installer was much more complex than it appears at first glance.
In fact, this operation using Windows 95 was associated with the release of “Operations” – these are three general terms: MS-DOS, Windows 3.1 and even Windows 95. This required full compatibility with various environments. The application is not allowed to register MS-DOS; after 3 hours after downloading, various tasks cannot work. The DOS component specified a minimum version of Win 3.1, the limited one then launched a 16-bit graphical installer.
This installer managed certain installation tasks, such as regarding data or configuration and drivers. At this point, Win32 was running on the Win9x network. Complete the installation, including enclosing the peripheral devices. Using three programs allowed Microsoft to reuse the development of a code reuse account base.
Source: Tech Cult

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