According to Hailey's upload on Codeberg, WSL9x runs the 6.19 Linux kernel cooperatively within Windows 9x, allowing users to interact with it just like they would a WSL instance in a modern Windows ...
If VirtualBox is not booting from ISO or if GParted ISO is not mounting, correct the Boot Order in System Settings and verify ...
Within seconds, you can see which file it's waiting on or why it's stuck.