["python","opencv","dll","path"]
ImportError: DLL load failed: %1 is not a valid Win32 application. But the DLL's are there

I have a situation very much like the one at Error "ImportError: DLL load failed: %1 is not a valid Win32 application", but the answer there isn't working for me. My Python code says: import cv2 But that line throws the error shown in the title of this question. I have OpenCV installed in C:\lib\opencv on this 64-bit machine. I'm using 64-bit Python. My PYTHONPATH variable: PYTHONPATH=C:\lib\opencv\build\python\2.7. This folder contains cv2.pyd and that's all. My PATH variable: Path=%OPENCV_DIR%\bin;... This folder contains 39 DLL files such as opencv_core246d.dll. OPENCV_DIR has this value: OPENCV_DIR=C:\lib\opencv\build\x64\vc11. The solution at Error "ImportError: DLL load failed: %1 is not a valid Win32 application" says to add "the new opencv binaries path (C:\opencv\build\bin\Release) to the Windows PATH environment variable". But as shown above, I already have the OpenCV binaries folder (C:\lib\opencv\build\x64\vc11\bin) in my PATH. And my OpenCV installation doesn't have any Release folders (except for an empty one under build/java). What's going wrong? Can I tell Python to verbosely trace the loading process? Exactly what DLL files is it looking for? I noticed that, according to http://www.dependencywalker.com/, the cv2.pyd in C:\lib\opencv\build\python\2.7 is 32-bit, whereas the machine and the Python I'm running are 64-bit. Could that be the problem? And if so, where can I find a 64-bit version of cv2.pyd?
Unofficial Windows Binaries for Python Extension Packages You can find any Python libraries from here.