Hi gwana,
Thank you for your interest in the Intel Joule Platform.
The Intel Joule supports Windows* 10 Iot Core, if you want to see how to setup follow this link: IoT - First-time setup | Intel® Software . In order to configure your device with a secure boot follow this link Building Secure Devices with Windows 10 IoT Core - Windows IoT. I hope you find this information useful, if you have any more questions please let me know, I will be happy to help you.
I will be waiting for your reply. Have a nice day.
Best Regards,
-Jose