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I've got a Windows 10 Computer (home edition), which has 4GB of Ram and an i5 processor. I need to run an old 32 bit accounting programme. The vendor said it won't release a 64 bit version (although a 64bit version exists, it's missing key features from the older version). The programme installs fine, but when I click on the programme icon, it says the programme won't work on a 64 bit system.

What options do I have? I've done a fair bit of research, but it seems to run up dead ends.

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1) WoW64 Apparently, this is supposed to let you run 32 bits on 64 bit Windows. However, I am not sure how to install it.

I think it's for web servers only. However, says it can work on Windows 7, but doesn't explain how to set it up (or if it will work on Windows 10). 2) XP mode A 32bit Windows XP emulator. However, it seems to be for Windows 7 only. Also according to this, you need Windows Professional.

3) Virtual Box Machine Let's you emulate Windows. Seems overkill for my purposes. Plus I would need to buy a 32 bit Windows license. I think it would run slowly with 4GB of Ram. 4) Partition drive into 32bit and 64 bit versions Apparently, you can use the free tool to split the drive into two and then install separate 32bit and 64 bit versions.

Again, seems overkill and it looks like I would need buy a 32 bit Windows 10 license. Are these my only options? Images Installation First run (From the error message I guess it's a 16-bit program) Clicking on programme. Simply put, if you want to operate an older, 16-bit program, you have to be running a 32-bit version of Windows., as they lack the compatibility layer (they are compatible with the more widely used 32-bit software, however).

There are some, but the key point here is that 16-bit programs won't execute. Edit: After revisiting this question some time later, I'd like to address your findings in the OP. • WoW64 lets you run 32-bit programs in a 64-bit Windows environment. It is built into the Windows operating system and does not require additional installation. Similarly, 32-bit installations of Windows can run 16-bit programs. • XP Mode was a feature of Windows 7 Professional, Enterprise, and Ultimate, that allowed you to run the more popular at the time Windows XP in a virtual machine.

• Virtual Box, or any virtual machine software (VMWare is another example) allows you to install an operating system inside and run it inside of your primary machine. This would be arguable the easiest way to achieve your goal as you could simply install the software onto a 32-bit virtual OS.

If you gave the VM 2GB of memory access, on a 32-bit install, it would run okay. Sluggish, but okay.

• Partitioning your drive would allow you to dual boot twin installations of Windows. This is a more permanent solution, and shouldn't be done IMO unless you can't run the VM.

Since you have already posted the diagram it is clear that you know why WOW64 exists. Now to answer your question: I'd like to know what happen in this layer. I think you want to know how it is implemented. Process startup: The loader loads 64-bit user-mode part 'Ntdll.dll' as usual, but also loads 32-bit Ntdll.dll in case the process is for 32-bit execution. It is now the loaders responsibility to initialize using Wow64.dll, which sets up process and thread contexts in 32-bit Ntdll and 'switches the CPU to 32-bit mode' for execution.

System Call: Everything is now running in 32-bit mode, until a system call. We know that system calls go through Ntdll.dll, User32.dll, and Gdi32.dll etc; in this case the 32-bit versions. There is a separate 32-bit version of these libraries located in Windows Syswow64 bit folder. These are just stubs that instead of issuing 'native system calls,' actually call in Wow64.dll.

Now, it's simple for Wow64.dll to transition to 64-bit mode, convert parameters to their 64-bit counterparts, issue the system call using 64-bit versions, get the result, and reconvert the output to 32-bit. It then transitions CPU back to 32-bit mode and returns the output. Exception dispatching, user callbacks, file system and registry operations, and I/O is handled in the same way, using hooks somewhere down the line. Read the book prescribed below. (especially, how they can convert address space). 64-bit address space is a superset of 32-bit address space. Plus, the same pointer (actually PTE) in 32-bit/64-bit isn't used to refer to the whole address space, but there are separate page tables for user-space and for system space.