So, I think I saw something about this said somewhere on the forums before, but i couldn't quite locate it.
But a lot of people have been having troubles with their .particle files. Their Rain and Snow files are missing. I thought I saw something about it having to do with exporting maps, but I had asked a friend who never exported maps, and her files are missing too. So, if anyone knows of a solution, it'd be helpful to a lot of us =3