Hello. I have installed the Windows version of Unbound and run as a service. The system runs Windows XP SP3 Pro. The Windows partition is D:\ . On service startup, with logging verbosity set to level 4 I see the following sequence of entries (seemingly unrelated entries omitted). [unbound:0] debug: autotrust: write to disk: D:\Program Files\Unbound\root.key.2788-0 [unbound:0] debug: autotrust: replaced D:\Program Files\Unbound\root.key [unbound:0] error: rename(D:\Program Files\Unbound\root.key.2788-0 to D:\Program Files\Unbound\root.key): File exists Needless to say that the modified attribute of root.key (or the actual contents) do not change after startup. To the best of my knowledge, the file is not locked my another process. Thanks in advance for any insights.