Unable to delete file on Data Store

VMware ESXI 6.5

I just migrated all my VM's from internal data stores to NAS NFS datastores all went well.

Now I went thru all the local data stores and I found folders of some of the VMS's I moved still lingering.

I had six of 60 VM's

I was able to verify non of the files are required and deleted the files and folder and they are all clear except for one file I can not delete

This VM is up and running and the new location has a vmdk  and this server only has one disk drive assigned.

File locked maybe?

Any ideas?

Thank you

Tom