Under NT 4.0, with Builder 3.0, I installed 3.3.3. Immediately afterward, I checked the registry. The key which should have read "C:\Program Files\Borland\Cbuilder3\Lib\doa.bpl" was actually named "Wintypes=Windows;WinProcs=Windows;DbiTypes=BDE;DbiProcs=BDE;DbiErrs=BDE\doa.bpl". The string "Wintypes=Windows;WinProcs=Windows;DbiTypes=BDE;DbiProcs=BDE;DbiErrs=BDE" does appear later in the registry. I suspect some kind of buffer/pointer overrun in the installation program. Just as a test, I tried to install 3.3.3 under Windows 98, and it seems to have worked just fine.