CWW File

What are CWW files and how to open them

Are you having problems opening a CWW file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your CWW files.

What is a CWW file?

A .CWW file is a Crossword Weaver Puzzle file.

Crossword Weaver Puzzle files store all the data needed by Crossword Weaver from Variety Games to design crosswords: the word list, clues, grid layout (including black and white squares), formatting for printed layout, title or subtitle, optional background colours and word bank.

These files are created and saved by Crossword Weaver as working or project files. The software allows editing of clues, adjusting layout, exporting puzzles for print or web, but the internal .CWW file holds the editable source from which all export formats derive.

Internally the file begins with a plain-text header string "CWWFileFormat=2.0\r\n" at the very start (offset 0).

How to open CWW files

Important: Different programs may use files with the CWW file extension for different purposes, so unless you are sure which format your CWW file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested five different CWW openers which you will find listed below.

Last updated: September 21, 2026

Various apps that use files with this extension

These apps are known to open certain types of CWW files. Remember, different programs may use CWW files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about CWW file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.