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.FNC File Extension

File Type 1	QuickCAM 3D CNC File (Most common)
File Format	File
Common?	No
File Description	Computer numerical control (CNC) file used by QuickCAM software; contains geometry information and instructions for a CNC milling machine; paths can be created from 3D models or 2D images.
Program(s) that open fnc files	Windows: Denford QuickCAM 3D or QuickCAM Pro

File Type 2	Frogans Player Network Certificate
File Format	Proprietary File
Common?	No
File Description	Certificate that permits the initialization of frogans networks; frogans are elements that appear on the Desktop and are written in the Frogans Slide Description Language (FSDL); the Frogans Network System Language (FNSL) is used to operate frogans networks. FNC files authorize connections to the main frogans network where addresses start "frogans*" on clients' systems.
Program(s) that open fnc files	Mac / Windows / Unix: STG Interactive Frogans Player

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/fnc