A kse file extension is related to the Keepsake Studio and used for its exported data files.
KSE file extension - Keepsake Studio export data
What is kse file? How to open kse files?
File type specification:
The kse file extension is associated with the Keepsake Studio, a tool for creating interactive photo albums.
The kse file stores exported data from app.
The Keepsake Studio seems to be obsolete product.