If it is the stuff that Nigel mentioned, sometimes called tinsel wire, then you are going to have a bit of fun. You will have to make a mechanical connection first, by separating the conductive threads from the filler material, bind the conductors together, and try to solder them. Not always possible to solder either, in the case of metalized plastic film. The whole joint will need support with something like a toothpick, etc, then be wrapped in tape or heatshink tubing. It won't be easy or pretty but can be done. There are special crimp terminals and splices for his type of wire, but I don't know if you could get them easily. You used to see them in the receiver of old phones, terminating the coiled cord to the mic or speaker, before modular plugs were used.