Class-Path: for Windows

I have a jar I created with manifest which contains a set of jar files as such:
Class-Path:
file:///c:/someDir/a.jar
file:///c:/some other dir/b.jar
When I try to access a class within b.jar, I always get a NoClassDefFoundError. If relocate the jar and rebuild the manifest so that the path does not include blank characters, then I find the class with no problem.
I have tried create the jar with the manifest as shown above, and I have tried using %20 in place of the blanks, but it still does not work:
file:///c:/some%20other%20data/b.jar

Class-Path Entries are relative to the Parent-Path of the JAR they're contained in.
Assume your JAR's URL is "file:///c:/anydir1/anydir2/JarWithClassPath.jar" then the Parent-Path is "file:///c:/anydir1/anydir2/". All Class-Path Entries are interpreted relative to this location.
See:
http://java.sun.com/developer/Books/javaprogramming/JAR/basics/manifest.html#applications

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http://java.sun.com/j2se/1.4/install-windows.html
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http://java.sun.com/j2se/1.4/docs/tooldocs/windows/classpath.html
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Invalid directory path for windows...?

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