There is only one file type that uses the .NM extension:
Space Engine Nebula Model File

- Developer Space Engine
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Popularity
- Category 3D Image Files
- Format N/A
File used by Space Engine, a 3D space simulation engine; saves a model of a nebula, which is a gas cloud in space; used for rendering the nebula during a space simulation; located in the /cache/models/nebulae/ directory of the Space Engine installation.
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Updated: July 8, 2013