Externally Generated Netlists

You can open netlists generated either by hand or from other schematic capture programs. These files usually have a filename extension of ".cir", but ".net" and ".sp" are understood. The text editor used for netlist files colorizes SPICE syntax for readability. The menu command Tools=>Color Preferences can be used to adjust the colors used in the editor. If the context of the netlist is ASCII, then the file is stored as ASCII. Otherwise the file format is UNICODE which includes every character of every living language. The LTspice simulator reads ASCII and UNICODE with equal ease.