I understand that BDE apps run just fine on 64-bit Windows.

We've got a client trying to put our BDE app on 64-bit XP Pro, the first time a client has tried this. I understand that bdeinst.dll will not get the BDE installed on any 64-bit system, so I've worked up an install that just gets the files put out to \Common Files\Borland Shared\BDE and installs the reg keys manually. No matter how I configure the install though I'm always getting $2108 errors when the app launches; under (x86), not under (x86), etc.

I've even tried a reg key setup that bypasses the WOW6432 subkey that MS wants to install the reg stuff to. Still nothing but $2108 errors.

What I'm doing wrong?

$2108 is "cannot load idapi32.dll". Either IDAPI32.DLL has been deleted or the path to IDAPI32.DLL has been changed in the DLLPath key under HKLM\Software\Borland\Database Engine.