You can create ".nicnt" files for unprotected libraries.
All you need to do is you need to take a ".nicnt" file (you can use the one above, that I made), and open it in a text editor, I use EditPlus editor, but you can try some other.
Then you need to edit My Library and My Library tags - put a name you want your library to be shown as, needs to be the same as the name of the file "My Library.nicnt"!
Then you need to edit ef5 and put something like a unique id into it. I think it HEX and therefore it may contain digits from 0 to 9 (like 123 or 984), or both digits and letters from a to f (like ff5).
Edit only those tags that I mentioned, don't delete any empty lines at the bottom of the file. Save the file when you're done.
Put the ".nicnt" and "wallpaper.png" into library root folder.
Usually root folder structure looks like this:
./Documentation/ (optional)
./Instruments/
./Multis/ (optional)
./Samples/
./My Library.nicnt
./wallpaper.png
Last but not least, after you add library via 'Add library', Service Center creates XML file
in win:
"C:Program FilesCommon FilesNative InstrumentsService Center"
in Mac:
"Macintosh HDLibraryApplication SupportNative InstrumentsService Center"
and in widows registry:
HKEY_CURRENT_USERSoftwareNative Instruments"Library Name"
HKEY_LOCAL_MACHINESOFTWARENative Instruments"Library Name