Why do you need an external tool for viewing CWR files? Would you like it integrated into your catalogue?
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Check out That Green Thing!
Syntax highlighting for Common Works Registration (CWR) files.
Limited to 1.000 lines. Supported CWR versions are: 2.1, 2.2, 3.0 and 3.1.
THIS TOOL IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED.
IN NO EVENT SHALL AUTHOR OR VENDOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY.