this is a tough one, I can tell my linguistics skills are getting rusty... I would say its a cursive style of Sanskrit as it looks to be an alphabet of somesort...
Some of it looks almost japanese, but I would also say it's a dead language. Some form of cuniform most likely. Could be sanskrit but doesn't look quite right for that either. 2nd question on where you found it.
Definitely not Chinese. Could be someone with really horrible handwriting writing in Katakana, but I doubt it. Doesn't look like what I've seen of Mongolian, Tibetan or Korean.
Dunno, where is it from?