[INTERFACES] win32 libpq version is "too new"

Hello,

I'm trying to run Delphi test programs using win32 client DLL for
6.4.2. 

But our Linux backend is older and I'm getting "unsupported frontend
protocol" from it.

I *can not* update the backend so:

Is there a binary version of the Windows client DLL that works with
postgresql_6.3.2-8? And then, where could I download it?

Another try: can I use any option to force the client to be backwards
compatible without recompiling it? Maybe in the connect call?

I've found in archives that it can be changed using #defines and
recompiling the sources, but installing VC++ just for this is a little
annoying O:)

TIA,
  Nico