spec/cordova/fixtures/projects/platformApi/platforms/windows/cordova/lib/PluginHandler.js
function getPluginFilePath(plugin, pluginFile, targetDir) {
    var src = path.resolve(plugin.dir, pluginFile);
    return '$(ProjectDir)' + path.relative(targetDir, src);
}
function getPluginFilePath(plugin, pluginFile, targetDir) {
    var src = path.resolve(plugin.dir, pluginFile);
    return '$(ProjectDir)' + path.relative(targetDir, src);
}
returns relative file path for a file in the plugin's folder that can be referenced from a project file.