The only reference to the path I have found is here:
C:\Program Files (x86)\Adobe\Adobe Flash Builder 4.6\eclipse\configuration\config.ini

the ini file containing the following code...

#This configuration file was written by: org.eclipse.equinox.internal.frameworkadmin.equino x.EquinoxFwConfigFileParser
#Fri Jun 15 15:56:15 BST 2012
org.eclipse.update.reconcile=false
eclipse.p2.profile=epp.package.java
osgi.instance.area.default=@user.home/Adobe Flash Builder 4.6
osgi.framework=file\lugins/org.eclipse.osgi_3.7.0.v20110613.jar
equinox.use.ds=true
eclipse.buildId=I20100608-0911
osgi.bundles=reference\:file\rg.eclipse.equinox.simpleconfigurator_1.0.200.v201 10502-1955.jar@1\:start
osgi.configuration.area=@user.home/Adobe Flash Builder 4.6/cascaded/335153/configuration
org.eclipse.equinox.simpleconfigurator.configUrl=f ile\rg.eclipse.equinox.simpleconfigurator/bundles.info
osgi.configuration.cascaded=true
eclipse.product=com.adobe.flexbuilder.standalone.p roducte36
osgi.framework.extensions=reference\:file\rg.eclipse.osgi.nl1_3.7.0.v20110716043402.jar
osgi.bundles.defaultStartLevel=4
eclipse.p2.data.area=file\:/C\:/Program Files (x86)/Adobe/Adobe Flash Builder 4.6/p2/
eclipse.application=com.adobe.flexbuilder.standalo ne.FlashBuilderApplication
osgi.shared.configuration.area=file\:configuration

Does anyone know how I can rewrite the line:
osgi.configuration.area=@user.home/Adobe Flash Builder 4.6/cascaded/335153/configuration

So I can point it at the users H:\ drive?