Apologies for not testing this earlier. Unfortunately, the answer is still no. It doesn't work. I have also tried to run the commands you mentioned. The output is:

macbook:Preferences$ arch
i386

macbook:Preferences$ machine
i486

macbook:Preferences$ lipo -info /Library/Application\ Support/ABxLDAP/ABxLDAPTool
Architectures in the fat file: /Library/Application Support/ABxLDAP/ABxLDAPTool are: x86_64 i386 ppc7400

macbook:Preferences$ lipo -info /Library/PreferencePanes/ABxLDAP.prefPane/Contents/MacOS/ABxLDAP
Architectures in the fat file: /Library/PreferencePanes/ABxLDAP.prefPane/Contents/MacOS/ABxLDAP are: x86_64 i386 ppc7400

macbook:Preferences$ lipo -info /Library/Frameworks/ABxLDAP.framework/ABxLDAP
Architectures in the fat file: /Library/Frameworks/ABxLDAP.framework/ABxLDAP are: x86_64 i386 ppc7400

this is a very strange issue. could we arrange another screen sharing session to take a look.

Hello,
I have exactly same issue (macbook, Leopard 10.5). Any update on that ? Thank you.