There is only one file type that uses the .N extension:
Neko Bytecode File
File compiled by Neko, a compiler for the .NEKO programming language; used to store Neko programs and saves them in a bytecode format that can be run by the Neko virtual machine (VM), which is supported on Mac, Windows, and Linux platforms.
Conceptually, the Neko VM is similar to the Java virtual machine (JVM). Just as the Java compiler compiles plain text .JAVA source code into bytecode that can be run by the JVM, the Neko compiler compiles the source code in NEKO files that can then be run on the Neko VM.
NOTE: N files may also be compiled from variant languages such as Haxe.
Updated: June 13, 2013