Ext. Type of file NAP NAPLPS format NAV Eudora script NEF Nikon digital camera RAW format NDX dBASE index NDX CDE index NFO Microsoft Information NFO Netware help (Folio infobase) NG Norton Guides text NIB OS X/iOS Interface Builder element NLM NetWare NLM program NRI Nero Burning CD-R layout NTZ InVircible antivirus blueprint