On upgrading following notices were given:
Could not find SYSTEM\CurrentControlSet\Control\FileSystem\LongPathsEnabled. Long paths will not be supported.
The 2 DMAs that gave that notice run Windows Server 2012.
Should I address these notices, and how?
Elaborating on Bert's answer: these errors are actively logged since RN 29910 (DataMiner version 10.1.7). On a more recent Windows OS, you can make the configuration of the LongPathsEnabled option in registry key Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem.