There is only one file type that uses the .NMSV extension:
Native Instruments Massive Sound File
Sound file created by Native Instruments Massive, a synthesizer application (DAW) that enables you to create and edit "massive" sounds such as deep, punchy bass lines; contains a pre-recorded or user-created sound with different custom settings for features such as filters, amps, fx, noise, and oscillators.
To create the NMSV file, select, name the file, choose the save location, and click .
To open the NMSV file, select, choose your NMSV file, and click .
NOTE: The NMSV file extension replaced the .KSD extension in version 1.3 of Massive. However, Massive will still open the KSD file, select, choose your KSD file, and click .
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Updated: July 27, 2014