轉(zhuǎn)載自：

http://cncc.bingj.com/cache.aspx?q=syswow64+system32+differenece&d=4721794509439110&mkt=en-US&setlang=en-US&w=DI2qviw609tjOQYxCwxoKnALrhb4APj-

摘取其中重要的兩段：

1System32?and?SysWOW64

On a 32-bit computer, all 32-bit programs store their files in C:\Program Files, and the system-wide library location is C:\System32.

On a 64-bit computer, 64-bit programs store their files in C:\Program Files, and the system-wide?C:\Windows\System32?folder contains 64-bit libraries. 32-bit programs store their files in C:\Program Files (x86), and the system-wide folder is C:\Windows\SysWOW64.

This is definitely counterintuitive. Despite the “32” in the name, the?System32?folder contains 64-bit libraries. And, despite the 64 in the name, the?SysWOW64?folder contains 32-bit libraries—at least on 64-bit versions of Windows.

In general, you won’t need to know this. The Windows operating system and programs you use automatically place their files in the correct location and use the correct folder. However, if you ever need to manually install a DLL file in the correct location or find where one is installed—which is very rare—you’ll need to know which is which.

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So Why Is?System32?64-bit, and?SysWOW64?32-bit?

All that brings us back to the million-dollar question: Why is the “System32” folder 64-bit, and?SysWOW64?32-bit?

The answer seems to be that many 32-bit applications were hardcoded to use the C:\Windows\System32?directory. When developers recompiled these applications for 64-bit versions of Windows, they continued to use the C:\Windows\System32?directory.

Rather than renaming the directory and forcing developers to move to the new one, breaking many applications in the process, Microsoft left “System32” as the standard system library directory. They created a new library directory for applications running under the WoW64 layer, which they named “SysWOW64”. When you think about it this way, the name makes more sense.

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大意是：

32位程序裡面“C:\Windows\System32”是寫死的，為了重編譯到64位時省事，就索性決定讓system32位裡面的dll都是64位的

言外之意就是：32->64位時，懶得改，導(dǎo)致system32為了滿足開發(fā)習(xí)慣，都是放置的64位的dll

總結(jié)

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