Rudy_X,
Ook al is dit misschien een iets meer 'bijzonder' onderwerp, toch zien we graag dat je zelf eerst voor onderzoek doet voordat je een topic opent. Ik kan dan ook niet helemaal uit je topic halen wat je zelf al gevonden hebt, en wat je al geprobeerd hebt.
Jouw 1e vraag kan je eigenlijk gemakkelijk op lossen door op de site van Microsoft te kijken:
Interoperability
Windows XP 64-Bit Edition provides a rich platform to integrate both 64-bit technical applications and 32-bit business applications using the Windows on Windows 64 (WOW64) x86 emulation layer. The WOW64 subsystem isolates 32-bit applications from 64-bit applications, preventing file and registry collisions. Both console and graphical user interface (GUI) applications are supported, as are service applications. The system provides interoperability across the 32/64 boundary for scenarios such as cut-and-paste operations and COM. However, 32-bit processes cannot load 64-bit dynamic-link libraries (DLLs), and 64-bit processes cannot load 32-bit DLLs.
While 64-bit hardware will be compatible with many 32-bit applications, 32-bit applications will perform better on 32-bit hardware. WOW64 is intended to run 32-bit personal productivity applications, enabling new levels of creativity and collaboration.
Ook is de in de 64bit FAQ behoorlijk wat te vinden:
Q. Will Windows XP 64-Bit Edition support 32-bit applications?
A. A key feature of Windows XP 64-Bit Edition is its ability to run 32-bit Windows-based applications unmodified on the 64-bit platform. To enable this capability, Microsoft has added a new 32-bit subsystem to Windows XP 64-Bit Edition. This subsystem—Windows on Windows 64—provides the 32-bit Windows services needed for applications to run properly even if they are not 64-bit. (Note: This subsystem does not support 16-bit applications.)
Over device drivers kan je het hier vinden:
Device Driver Installation
Windows XP 64-Bit Edition requires the installation of 64-bit drivers only. Some device drivers are modified to allow installation of 64-bit and 32-bit drivers from the same .inf file. These modifications also prevent installation of the wrong driver on the wrong platform. The extension .ia64 is used in the .inf file of these drivers to identify the installation files and sections in the .inf file that can be installed on the 64-bit platform. Previous versions of Windows do not recognize the .ia64 extension, and ignore any .inf file entries that contain it.
Al met al lijkt het me dat je deze info gewoon had kunnen vinden door zelf een klein beetje initiatief te tonen ?

F_J_K