Test java/nio/Buffer/LimitDirectMemory.sh failed on 64 bit JDK on Windows.
As I see in test definition the execution is skipped for x86_64 only for SunOS|Linux, but not Windows
case "$OS" in
  SunOS | Linux )
    if [ `uname -p` = "x86_64" ]
    then
        echo "Test Skipped for AMD 64"
        exit 0
    fi
    TMP=/tmp ;;
  Windows* ) TMP="c:/temp" ;;
  * )
    echo "Unrecognized system!"
    exit 1;
    ;;
esac

so execution of runTest -XX:MaxDirectMemorySize=42000000000000000t -cp ${TESTCLASSES} \
  LimitDirectMemory true 0 DEFAULT+1M (/test/java/nio/Buffer/LimitDirectMemory.sh:88)
failed as
        throw new RuntimeException("OutOfMemoryError not thrown: "
                       + incr);
(LimitDirectMemory.java:33)

So I define it as test issue. also because it passed on 32 bit JVM
(regression test train for 1.5. doesn't have an execution for -XX:MaxDirectMemorySize=42000000000000000t

how to reproduce
install 1.4.2_12b1 with support AMD64 (j2sdk-1_4_2_12-windows-amd64.exe)
then run JTreg with appropriate JDK
The workspace is placed on /net/latte.ireland/deployment1/regtests/142u12/
the JTreg is placed on /net/latte.ireland/deployment1/sqe-tools2.1.6fcs
to run please follow instructions http://jqa.ireland/procedures/test_procedures/141_test_procedures/RegressionTestExecution.html
And -automatic -bug:4627316 flags to that script