how to recovery ext4.vhdx after cmd: wsl –unregister ubuntu?

i accidently trusted bing ai says:i can run unregistered cmd ,it will not delete ext4.vhdx . i have so many important work on wsl and have no backup.

and i immediately stop write file to volume d and set it to readonly:

i tried winfr cmd,not find ext4.vhdx file .
i tried set the volume to read only and use disk drill , it not find my file.
but I tried diskgenius, it find ext4.vhdx but 0KB .