The jar files should be located in the following directory: C:\Program Files\Exelis\IDL82\bin\bin.x86_64\plugins The configuration file, config.ini, points to these files. This file is located here: C:\Program Files\Exelis\IDL82\bin\bin.x86_64\configuration Make sure the config.ini is pointing to the plugins directory. Here is an example config.ini: eclipse.p2.profile=IDLWin64profile osgi.framework=file\:plugins/org.eclipse.osgi_3.7.2.v20120110-1415.jar equinox.use.ds=true osgi.bundles=reference\:file\:org.eclipse.equinox.simpleconfigurator_1.0.200.v20110815-1438.jar@1\:start org.eclipse.equinox.simpleconfigurator.configUrl=file\:org.eclipse.equinox.simpleconfigurator/bundles.info eclipse.product=com.rsi.idldt.workbench osgi.splashPath=platform\:/base/plugins/com.rsi.idldt osgi.framework.extensions= osgi.bundles.defaultStartLevel=4 eclipse.p2.data.area=@config.dir/../p2 eclipse.application=org.eclipse.ui.ide.workbench