NWCTXT2Ly can convert Noteworthy songs to LilyPond in Windows.

The program can be used in 2 ways:
1. As a Noteworthy "User Tool" to convert a single stave of Noteworthy music to LilyPond, and
2. As a standalone program that converts an entire Noteworthy score to a complete LilyPond score.

Usage:
Click the Browse button and locate the NWCTXT file youve just exported. Ignore the other options for now and just click the Go button. It should tell you that youve written 4 staves with 4 voices. If you now look in the folder/directory where the NWCTXT file was stored, youll see about 11 new files - some with a .ly extension and others with a .nwcextract extension.
The .ly files are LilyPond files and are used to create the score. The .nwcextract files are just used by my program during its processing. If youre keen on housekeeping, you can delete them.

The license of this software is Freeware, you can free download and free use this audio utility software.