The dll is part of the inno setup installer and also from the msi installer.
This file is installed with our default installer.
Vnc log all connections in a file mslogon.log but also as standard event, viewable with the eventviewer.
The logmessages.dll is part of the event logging. When the file doesn't exist, the event viewer was saying some unknown application
sended a message with info ip x loggedon succesfull at date... with the dll the app is known.
He is just responsible for making the event message proper...but not required
The entry in the registry is added by vnc, not the installer, so yes it can exist even when the dll isn't.
I don't know why the file is missinghttp://www.uvnc.com/downloads/ultravnc/ ... -1212.html
If you donload the ALL bin zip from our website, it contain all exe and dll's, the logmessages.dll is part