The installer log for studio contains the following in the install log:
Unpacking C:\Liferay\devstudio\com.liferay.ide.studio-win32.win32.x86_64.zip
Executing java -jar "C:\Liferay\devstudio\com.liferay.portal.tools.bundle.support.jar" createToken --force --email aaa@bbb.com --password xxxx