%Windir%\system32\ (typically C:\WINDOWS\system32\)
clipbrd.exe -- ClipBook Viewer
Big question, can I actually use it for anything? (Grrr, vim is better); windows clipboard management out of box seems to suck, or require finding a program almost no ones ever heard of :\
ftype -- manages file associates
very bloody useful - no more need to invoke explorer.exe to play with them.
systeminfo -- quick print useful data
Gotta remember this next time I'm working on a system; msinfo32 provides more info, but for some dang reason always seems to need start.exe or rhe run dialog to launch it. systeminfo gives a good first look, and is easier to grep.
Windows XP does have some useful changes from DOS 5/6 based releases, but I've never actually found a lot that isn't in my MS-DOS reference >_>.