A cwn file extension is related to the Chord Notation Editor: Cifraweb. A cwn file contains notation.
CWN file extension - Chord Notation Editor: Cifraweb notations data
What is cwn file? How to open cwn files?
File type specification:
The cwm file extension is associated with the Chord Notation Editor, a notation composing software for Microsoft Windows developed by Marson Ramos.
The cwm file stores notation document created in the Chord Notation Editor.