That's an 'after-market' custom voice. I think there are a couple of versions around of Governator/Terminator and one is X-rated with the f-bomb in it so be careful with that.

All properly-made custom .vpm voices will work in most nuvis [3xx/6xx may be exceptions for some but only some made by Garmin themselves afaik] but they are no problem in 2012 series such as 3590. Naming is crucial, and is dependent on the original voice 'shell' used to create the custom voice. Most used is the standard American English voice for that, so the *.vpm voice needs to be named only English_American_.vpm [note the under-score positioning] replacing any current file of that name on the nuvi, and no other naming will work. A known exception to this is a common Borat voice which is based on English_British_.vpm and there are for sure other EN custom voices which will only work named other than English_American_.vpm but i'm not aware of any Governator/Terminator voice based on anything else.