Hi Benny,
Your plant is identical to a big one I lost to a winter freeze a few years ago but I don't have a clue as to the name. I treated it like an understory-type tropical, with bright light but no direct sun and a moss pole for climbing.
You might want to post your photo over on the Aroids forum to see if one of the more knowledgeable Aroid folks recognize your lovely Philo:
http://garden.org/forums/view/...
