My understanding is that there is no official policy for civilian CCW, however technically according to the law open carry is legal on public property, private property with permission of landowner, not inside government buildings, etc. If I recall correctly, though, the catch is that open carry is regulated by the DNR or other such agency and is dealt with in the hunting statutes. So that limits what you can carry and in any populated area you are likely to get tagged with "Disturbing the Peace" or something of the like.
But don't take my word for any of this, I am not a lawyer, etc...