NIFF

Notation Interchange File Format
File type: Audio and sound file
Files with niff extension are used as standard digital format for the representation of standard musical notation.
Found 2 different file type records with the same niff filename suffix.
What is niff file?
File type category:
Audio and sound file
Date updated: August 3, 2017
The niff file extension is related to Notation Interchange File Forma. NIFF was completed in the fall of 1995. This is a standard digital format for the representation of standard musical notation. The format is very flexible, allowing for simple implementations with minimal graphical information, or much more elaborate descriptions including all aspects of page layout, associated midi data, custom symbols, etc.
MIME: vnd.music-niff
How to open niff file?
Use Personal Composer to import niff file format data.
Associated software actions with the niff file
Software apps that import niff files:
Mozart (Microsoft Windows)
Personal Composer (Microsoft Windows)
Software apps that export niff files:
Personal Composer (Microsoft Windows)
SharpEye Music Reader (Apple macOS / Mac OS X)
NIFF Navy Image File Format
File type category:
Bitmap image file
Date updated: June 23, 2025
The niff file extension is also used for some older bitmap graphic interchange format called Navy Image File Format.
Most likely some old format without support. No further information could be found.
MIME types:
image/x-niff
application/x-niff
How to open niff file?
Some image viewers might still be able to view this old format.
How to convert niff file?
Possibly can be exported to other formats.
Suggested software to open niff file:
Associated software actions with the niff file
Programs for viewing niff files:
XnView MP (Multiplatform)
Software apps that print niff files:
XnView MP (Multiplatform)