The bug was introduced in Samba 4.17.0. Unraid switched to the 4.17 series in late September 2022, so OP probably ran into this error for the first time after updating Unraid.

Yeah, that's a good workaround. I was just re-reading the OP one more time and noticed: I can replicate it locally by CD into the directory with CMD.exe. Change the file name with "rename". If I keep command prompt open or stay in that directory, I cannot change it. As soon as I close command prompt ...

Thanks for the reply. I did a deeper dive on ADS's (Alternate Data Streams) which are the "xattr" at work here. NTFS uses ADS's for storing named streams like what FileBot is using; usually on a Unix based host this would be done with extended attributes. The SMB protocol is using NTFS as a virtual ...

I don't think the above conclusion is wholly accurate, or there are multiple paths here. I am not using UnRaid but typical NAS samba configs will have similar configuration as I have. I can reproduce this issue like this: 1. Start with samba server and a Windows client with a share mounted. Make ...