Hello Dave!
I had copied the files "php4ts.dll" and "msvcrt.dll" to the \winnt\system32 directory. The others libraries are in the \php4\extensions\ directory, but I don't found the file that you call "EXT.INI", the file where I write the extensions and their own directory, is "PHP.INI" that it is the file "php.ini-dist" which is in the root directory of the pack distribution.
Julete.