Files with kiz extension are used by many applications which are developed by Kodak company. They contain postcards created from photos.
KIZ file extension - Kodak digital postcard file
What is kiz file? How to open kiz files?
File type specification:
The kiz file extension is associated with applications developed by Kodak for editing and managing digital photos captured by its digital cameras. The .kiz file stores postcard created from photo in digital file format.
This software seems to be obsolete, kiz file format is not supported by current applications.
