32-bit programming for Windows 95/98/ME or NT/2000/XP using assembler, you will find everything you need here including an Assembler, Resource Compiler, Linker, Symbolic Debugger, Editor, Integrated Development Environments (IDEs), Help Compiler, etc...
A file system filter driver intercepts requests targeted at a file system or another file system filter driver. By intercepting the request before it reaches its intended target, the filter driver can extend or replace functionality provided by the origin
these are samples, not complete applications. The code (and coding style) is not meant to be industrial strength; it's not even well-designed. The sole purpose of the samples is illustrating a point, not teaching proper coding style.
Why it is not replaced by COM, how it works, network DDE, links to other sources of information. DDE is support is being removed from Windows (Windows 7 x64 seems to have an issue with it)