HYPER-V Cluster W2012R2 Can't delete VHDX on CSV

'm working on a Windows 2012 R2 Hyper-v. I've just done an EXPORT of a Virtual Machine to a CSV Volume to import later.

But I hanve't performed the import, and when I went to delete the exported folder I've got an access denied error of the VHDX file.

How can I identify which is the process that locks this file and delete it? There no is any Virtual Machine with this file attached on it.

I've restarted the "Hyper-V Virtual management server" service without success.

This is not a permission problem because I've also tried to take ownership to reset permissions, but I'm also getting an 'access denied error'. Also with CACLS command.

Regards