Filename contains restricted character '\': C:\libraries\the\path\to\the\file\directory\FMODAirN

Could this be a bug within adt.jar?

When running the adt.jar java app as an ant task within Flash Builder 4 I get the following error:

Filename contains restricted character '\': C:\libraries\the\path\to\the\file\directory\FMODAirN

Every single property expanded within the <java> ant task with the exception of ane.target.platform includes ${basedir} which evaluates to C:\libraries\the\path\to\the\file\, yet only the last parameter in the argument list for adt.jar complains regarding a restricted character:

ane.extension.descriptor=${basedir}/directory/extension.xml

ane.keystore=${basedir}/directory/test.p12

ane.src.library=${basedir}/directory/library.swf

ane.target.platform=Windows-x86

ane.project.name=${basedir}/directory/air.fmod.ane.ane

ane.swc.name=${basedir}/directory/air.fmod.ane.swc

native.library=${basedir}/directory/FMODAirNativeExtension.dll

<target name="default" depends="clean, init">

          <java jar="${FLEX_HOME}/lib/adt.jar" fork="true">

                    <arg value="-package"/>

                    <arg value="-tsa"/>

                    <arg value="none"/>

                    <arg value="-storetype"/>

                    <arg value="pkcs12"/>

                    <arg value="-keystore"/>

                    <arg value="${ane.keystore}"/>

                    <arg value="-storepass"/>

                    <arg value="test"/>

                    <arg value="-target"/>

                    <arg value="ane"/>

                    <arg value="${ane.project.name}"/>

                    <arg value="${ane.extension.descriptor}"/>

                    <arg value="-swc"/>

                    <arg value="${ane.swc.name}"/>

                    <arg value="-platform"/>

                    <arg value="${ane.target.platform} ${ane.src.library}"/><!--missing library error if ${ane.src.library} is on its own line-->

                    <arg value="${native.library}"/><!--Filename contains restricted character '\': C:\libraries\the\path\to\the\file\directory\FMODAirN-->

          </java>

</target>

<target name="default" depends="clean, init">

          <java jar="${FLEX_HOME}/lib/adt.jar" fork="true">

                    <arg value="-package"/>

                    <arg value="-tsa"/>

                    <arg value="none"/>

                    <arg value="-storetype"/>

                    <arg value="pkcs12"/>

                    <arg value="-keystore"/>

                    <arg value="${ane.keystore}"/>

                    <arg value="-storepass"/>

                    <arg value="test"/>

                    <arg value="-target"/>

                    <arg value="ane"/>

                    <arg value="${ane.project.name}"/>

                    <arg value="${ane.extension.descriptor}"/>

                    <arg value="-swc"/>

                    <arg value="${ane.swc.name}"/>

                    <arg value="-platform"/>

                    <arg value="${ane.target.platform} ${ane.src.library}"/>

                    <arg value="-C"/>

  <arg value="C:/libraries/the/path/to/the/file/directory/FMODAirNativeExtension.dll"/><!--Filename contains restricted character '\': C:\libraries\the\path\to\the\file\directory\FMODAirN-->

          </java>

</target>

Any help would be appreciated!