Your 32 bit dll should work just fine on a 64 bit machine as long as it is loaded into a 32 bit process - attempting to load a 32 bit dll into a 64 bit process will fail. If your project is a.Net (e.g. C#) application then you should be able to target your assembly at x86 in order to get your 32 bit dll working correclty.
I would including to understand when do we require to place a document under
C:WindowsSystem32 or C:WindowsSysWOW64, on a 64-pieces windows system.
I experienced two DLL't, one for 32-bit, one for 64-bit.
Logically, I believed I'd spot the 32-bit DLL under C:WindowsSystem32, and the 64-bit DLL under C:WindowsSysWOW64.
To my surprise, it'sthe additional method around! The32-bit one will go into C:WindowsSysWOW64, and the64-bit DLL will go into C:WindowsSystem32.
Extremely confusing things. What's the cause behind this?
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5 Answers
I think the intention had been to rename Program32, but therefore many applications hard-coded for that path, that it wasn't achievable to eliminate it.
SysWoW64 wasn'capital t designed for the dlls of 64-bit techniques, it'beds really something like 'Windows on Windows64', meaning the bits you need to operate 32bit apps on a 64bit windows.
This write-up points out a bit:
'Home windows times64 has a directory website System32 that includes 64-bit DLLs (sic!). Thus native procedures with a bitness of 64 discover “their” DLLs where they expect them: in the System32 folder. A second listing, SysWOW64, consists of the 32-bit DLLs. The file program redirector does the magic of concealing the actual Program32 directory website for 32-bit procedures and showing SysWOW64 under the name of Program32.'
Edit: If you're speaking about an installer, you reallyshould nothard-code the path to the system folder. Instead, let Home windows take care of it for you structured on whether or not your installer is certainly operating on the emulation level.
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I should add: You should not be putting your dll't into program32 anyway! Modify your code, alter your installer. discover a house for your pieces that is usually NOT anyplace under c:windows
For example, your installer puts your dlls into:
(Notice:The way you in fact do thiscan be to use the environment var: %ProgramFiles% or %ProgramFiles(x86)% to discover where Plan Files is. you do not presume it can be c:program data files.)
and after that pieces a registry label :
The program code that uses your dlls states the registry, then dynamically back links to the dlls in that place.
The above is usually the clever way to go.
You perform not ever set up your dlls, or third celebration dlls into system32 or syswow64. If you have got to statically load, you put your dlls in your exe dir (where they will be discovered). If you cannot forecast the exe dir (age.gary the gadget guy. some other exe is heading to contact your dll), you may have got to put your dll dir into the research path (avoid this if at all poss!)
program32 and syswow64 are usually for Home windows provided files.not really for anyone elses files. The just reason people got into the bad routine of putting things there is definitely because it is certainly continually in the research path, and many apps/segments use static linking. (Therefore, if you really get lower to it, the real sin is static linking - this is definitely a sin in native program code and maintained code - generally always often dynamically link!)
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Went into the exact same issue and explored this for a few a few minutes.
I had been taught to use Windows 3.1 and DOS, remember those days? Shortly after I worked with Macs computers purely for some time, then began to sway back again to Windows after buying a x64-bit machine.
There are actual reasons behind these modifications (some would say historical significance), that are usually necessary for developers to continue their function.
Most of the changes are talked about above:
System Data files
vsProgram Data files (back button86)
In the beginning the 16/86bit files were written on, '86' Intel processors.System32
actually indicatesProgram64
(on 64-bit Home windows)When developers first began working with Windows7, there had been several compatibility issues where various other applications where kept.SysWOW64
actually meansSysWOW32
Essentially, in simple english, it means'Home windows on Home windows within a 64-bit device'. Each folder can be showing where the DLLs are usually located for programs it they wish to make use of them.
Right here are usually two links with all the basic info you need:
Wish this clears factors upward!
CrispyCrispy
Program32 will be where Windows historically positioned all 32bit DLLs, and Program had been for the 16bit DLLs. When microsoft created the 64 bit Operating-system, everyone I know of anticipated the files to settle under System64, but Microsoft decided it made even more sense to place 64bit files under System32. The only thinking I have been able to discover, is definitely that they desired everything that had been 32bit to work in a 64bit Windows w/o having to alter anything in the programs - just recompile, and it's accomplished. The way they solved this, therefore that 32bit applications could nevertheless run, was to develop a 32bit home windows subsystem known as Windows32 On Windows64. As like, the acronym SysWOW64 was created for the Program listing of the 32bit subsystem. The Sys is usually brief for System, and Surprise64 can be short for Home windows32OnWindows64.
Since home windows 16 is definitely already segregated from Windows 32, there has been no need for a Home windows 16 On Home windows 64 equivalence. Within the 32bit subsystem, when a system goes to use documents from the program32 listing, they actually obtain the data files from the SysWOW64 index. But the procedure is mistaken.
Since home windows 16 is definitely already segregated from Windows 32, there has been no need for a Home windows 16 On Home windows 64 equivalence. Within the 32bit subsystem, when a system goes to use documents from the program32 listing, they actually obtain the data files from the SysWOW64 index. But the procedure is mistaken.
It's a horrible style. And in my knowledge, I acquired to do a lot more adjustments for writing 64bit applications, that merely modifying the Program32 listing to learn Program64 would have ended up a very small change, and one that pre-compiler directives are usually intended to manage.
ArmandArmand
Various other folks possess already performed a great job of detailing this ridiculus conundrum. and I think Chris Hoffman did an also better job right here: https://www.howtogeek.com/326509/whats-the-difference-between-the-system32-and-syswow64-folders-in-windows/
My two thoughts:
- We all make ridiculous short-sighted mistakes in life. When Microsoft called their (at the time) Get32 DLL directory site 'Program32', it produced feeling at the period. they simply didn't get into thing to consider what would occur if/when a 64-bit (or 128-bit) edition of their OS got created later - and the substantial backward compatibility concern like a website directory name would result in. Hindsight will be always 20-20, so I can't actually fault them (too very much) for like a error.HOWEVER. When Microsoft did later develop their 64-bit operating system, even with the advantage of hindsight, why oh why would they create not only the exact same short-sighted error AGAIN but create it actually worse by PURPOSEFULLY providing it like a deceptive name?!? Shame on them!!! Why not AT Minimum actually title the website directory 'SysWin32OnWin64' to avoid confusion?!? And what happens when they ultimately create a 128-bit OS. after that where are they going to put their 32-bit, 64-bit, and 128-bit DLLs?!?
- All of this logic still appears completely mistaken to me. On 32-bit versions of Home windows, System32 includes 32-bit DLLs; on 64-bit variations of Home windows, System32 includes 64-bit DLLs. so that designers wouldn't have got to make code changes, appropriate? The problem with this logic will be that those programmers are either now making 64-bit apps needing 64-bit DLLs or they're also producing 32-bit apps needing 32-bit DLLs. either way, aren't they still screwed? I imply, if they're also still making a 32-bit app, for it to right now operate on a 64-bit Windows, they'll today require to make a program code switch to discover/reference the same ol' 32-bit DLL they used before (now located in SysWOW64). Or, if they're functioning on a 64-bit app, they're heading to need to re-write their old app for the fresh OS anyway. so a recompile/rebuild had been heading to end up being needed anyway!!!
Microsoft just affects me sometimes.
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