N (40 file types)
File extensions that start with the letter N

Extension	Name of file type	Ranking
.nav	Id Tech 3 Bot Navigation File
.nb	Mathematica Notebook File
.nbf	Nokia Backup File
.nbu	Nokia Pc Suite 6.82+ Backup File
.nc	Mastercam Numerical Control File
.ncb	Visual C++ IntelliSense Database File
.ncd	Nero Coverdesigner Image Format File
.ndb	ClamAV Extended Signature File
.ndf	SQL Server Secondary Database File
.ndk	Lotus Notes Database Design Elements File
.nds	Nintendo Ds Game Rom Image File
.ndx	dBASE Index File
.nef	Nikon Digital SLR Camera Raw Image File
.nes	Nintendo (NES) ROM File
.net	Netviz Project File
.nfo	Warez Information File
.nif	Gamebryo Model File
.njb	Nikon Digital SLR Camera Image Index File
.nls	Microsoft National Language Support File
.not	Notation File
.npf	NTI Partition File
.npp	Art Explosion Publisher Pro Document File
.nra	Nero Audio-cd Compilation File
.nrg	Nero-Burning ROM CD or DVD image File
.nri	Nero Cd-rom (iso) Compilation File
.nrl	Autonomy Interwoven Link File
.nrw	Nikon Raw Image File
.nsf	Lotus Notes Database File
.nsi	NSIS Script File
.nst	NoiseTracker Module File
.nt	Windows NT Startup File
.ntf	Lotus Note Template File
.nth	Nokia Series 40 And 60 Theme File
.ntx	Theword Encrypted Module File
.nup	Eset Nod32 Antivirus Update File
.nvc	NeroVision Express Project File
.nvm	PlayStation 2 BIOS Configuration File
.nwc	Noteworthy Composer Song File
.nws	Windows Live Mail Newsgroup File
.nzb	Newzbin Download Pointer File

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