There is only one file type that uses the .NDK extension:
Lotus Notes Design Elements File
Contains Lotus Notes design elements, which are used to create and customize the interface for Lotus users; "DESKTOP6.NDK" contains design elements, while "CACHE.NDK" stores recently used elements.
Previous versions of Lotus Notes used the .DSK extension for design elements files.
|IBM Lotus Notes and Domino Designer|
Updated: January 6, 2008