Sony Mobile has update their new Xperia Companion PC application to version 18.104.22.168 which adds new feature and brings support for many old models. So Sony Mobile has widened the support for for Xperia models back to Xperia J. Also this new version allows users to backup up their Xperia devices and even now you can restore them.
Also there's another change that is not noticeable, now the settings menu includes a new option allowing you to toggle whether the Xperia Companion app shows in the notification area once your computer starts. Download the Xperia Companion app from the below link.