WOW64 is the x86 emulator that allows 32-bit Windows-based applications to run seamlessly on 64-bit Windows. This allows for 32-bit (x86) Windows applications to run seamlessly in 64-bit (x64) Windows, as well as for 32-bit (x86) and 32-bit (ARM) Windows applications to run seamlessly in 64-bit (ARM64) Windows. WOW64 is provided with the operating system and does not have to be explicitly enabled. For more information, see WOW64 Implementation Details.
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The system isolates 32-bit applications from 64-bit applications, which includes preventing file and registry collisions. Console, GUI, and service applications are supported. The system provides interoperability across the 32/64 boundary for scenarios such as cut and paste and COM. However, 32-bit processes cannot load 64-bit DLLs for execution, and 64-bit processes cannot load 32-bit DLLs for execution. This restriction does not apply to DLLs loaded as data files or image resource files; for more information, see LoadLibraryEx.
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A 32-bit application can detect whether it is running under WOW64 by calling the IsWow64Process function (use IsWow64Process2 if targeting Windows 10). The application can obtain additional information about the processor by using the GetNativeSystemInfo function.
Note that 64-bit Windows does not support running 16-bit Windows-based applications. The primary reason is that handles have 32 significant bits on 64-bit Windows. Therefore, handles cannot be truncated and passed to 16-bit applications without loss of data. Attempts to launch 16-bit applications fail with the following error: ERROR_BAD_EXE_FORMAT.
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Is there a way to load a 32bit DLL library (something with the same usage as LoadLibrary) I would like to use that function along with GetProcAddress.
I looked at WOW, but it does not seem to offer the functionality. The lord of the rings a readers companion pdf. The functionality should exist, since tools like DependencyWalker are able to read the symbols of a 32bit dll even though its 64bits.
thanks
3 Answers
Sorry, but you can only load a 32bit DLL into a 64 bit process when you are loading the dll as a datafile. You can't execute the code. http://support.microsoft.com/kb/282423
Microsoft recommends that you use interprocess COM to use 32 bit code with a 64 bit application. Here's an article explaining the process http://blog.mattmags.com/2007/06/30/accessing-32-bit-dlls-from-64-bit-code/ Its not fun.
There's a difference between reading a 32 bit executable and executing code within a 32 bit executable. I don't believe that windows offers any functionality to do that.
The only way you're likely to be able to do that is to create a 32 bit process that loads the dll and then do interprocess communication to pass the results between the two processes.
If all you're wanting to do is get resources from it, you can load as a datafile:
Then call FindResource
as normal.