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After much trial and error(!), assuming OpenCV is installed on a Windows machine at <opencv-dir>:

• The JAR is in <opencv-dir>\build\java.
• On a 32-bit Windows machine, the Native Library Location is <opencv-dir>\build\java\x86.
• On a 64-bit Windows machine, the Native Library Location is <opencv-dir>\build\java\x64.

Therefore, on my 64-bit Windows 7 PC with OpenCV installed at D:\opencv:

• The JAR is in D:\opencv\build\java.
• The Native Library Location is D:\opencv\build\java\x64.