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It doesn't. OpenJDK provides no binaries for Windows as far as I'm aware. The build setup is pretty complex and requires a combination of Cygwin and Microsoft tools: http://hg.openjdk.java.net/jdk7/build/raw-file/tip/README-bu...

Basically, Oracle's JDK/JRE is the OpenJDK build for Windows that normal people can use. That's it.

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Is the use of OpenJDK along with any Java code free for commercial use?.. Or do companies that use OpenJDK have a chance to have Oracle charge them for using its technologies?..

Using OpenJDK is completely free, as far as I'm aware. Redistributing OpenJDK bits is covered by GPL2 with some Sun/Oracle amendments: http://openjdk.java.net/legal/

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