Hi,
Thank you for your reply,
On the Backup Application side, NetBackup only launches commands via the APIs to create and delete snapshots.
On the file side, yes these are indeed orphan files, this has been checked with VMWare support.
For my part, I regularly list them in Powercli with the "Get-VmwOrphan" function of lucD.
To delete these files I take my precautions, I perform a Storage vMotion of the vm and I delete all the files that have not migrated.
I insisted with the support for 1 month and I just learned that they escalated our ticket.......