With Filestar you get 0 different skills for working productively with IPUZ Crossword (.ipuz) files.
About .Ipuz
Name
IPUZ Crossword
Extension
.ipuz
Format
Text
Category
Game
Developer
ipuz.org
Description
An IPUZ crossword: an open JSON document (ipuz.org) that describes a crossword puzzle - the grid with its clue numbers and black squares, the across and down clue lists, and the solution - so any puzzle app or web page can read it without a proprietary library.