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How to open .CWW files on Windows

To open .CWW files on Windows, determine the source: if it’s from a crossword/puzzle context, install and open it with Crossword Weaver; if it’s from a wood/structural engineering workflow, open it within the relevant WoodWorks application (e.g., Sizer or Shearwalls).

Step-by-step instructions

  1. Determine the source: if it’s from a crossword/puzzle context, install and open it with Crossword Weaver; if it’s from a wood/structural engineering workflow, open it within the relevant WoodWorks application (e.g., Sizer or Shearwalls).
  2. In File Explorer, right-click the .CWW file → Open with → Choose another app, then select the appropriate program.
  3. If the file is a WoodWorks database, use the WoodWorks product’s database features/workflow (per WoodWorks help) rather than trying to import it into unrelated software.

Alternative methods

  • Open .CWW in a browser-based viewer if desktop apps fail.
  • Try opening .CWW on Windows with a secondary app to rule out app-specific issues.
  • Convert .CWW only with trusted tools when direct opening is not possible.

Common issues

The .CWW file won’t open (wrong program)

The .CWW extension is used by different, unrelated formats. If you open it in the wrong application (or an OS-default app), it may fail or show as corrupted.

  1. Check where the file came from: Crossword Weaver puzzle vs. WoodWorks database (Sizer/Shearwalls workflow).
  2. Open it using the matching application (Crossword Weaver for puzzle files; the relevant WoodWorks software for database files).

Windows asks “How do you want to open this file?”

No application is currently associated with .CWW on your system, or the required software is not installed.

  1. Install the correct software for your .CWW type (Crossword Weaver or the applicable WoodWorks program).
  2. Use Right-click → Open with to pick the installed program and optionally set it as the default.

File appears corrupted or incomplete

Binary data files can fail to open if truncated during download/copy, or if created by a newer/older version that isn’t compatible with your installed software.

  1. Re-copy or re-download the file from the original source (avoid email clients or cloud sync conflicts if possible).
  2. Try opening it with the same product and version family that created it (e.g., the corresponding WoodWorks application, or Crossword Weaver).

Trying to edit a WoodWorks .CWW database directly

WoodWorks documentation describes .cww as a binary database format, which is not intended for manual editing and may be locked to the application’s database management process.

  1. Use the WoodWorks application’s supported database workflow (per WoodWorks help) rather than editing the file in a text or hex editor.
  2. If you need to change materials/components, make the changes through the WoodWorks software features designed for database management.

Security note

.CWW files are typically binary data; they are not meant to contain macros like office documents, but a malicious or malformed file can still exploit bugs in the program that parses it—only open files from sources you trust.

Back to .CWW extension page