There is only one file type that uses the .NGLOSS extension:
Nisus Writer Glossary
Glossary used by Nisus Writer Pro, a rich text word processing application; contains glossary entries, which act as shortcuts,they are abbreviations that can be typed then are replaced with the corresponding words (that usually contain a lot more characters).
NWM files are located in the following directory:
~/Library/Application Support/Nisus Writer/Glossaries
You can create, edit, import, and delete NGLOSS files by selecting, and then select the "QuickFix" Band-Aid icon. In the bottom-right corner, you'll see the four different options. The checkbox next to each glossary indicates whether the glossary is activated or not.
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Updated: February 10, 2014