i took off his skis and he didnt stop so then i droped them on the ground and he continues to ski wich is quite amusing but it wont be verry practical come springtime

Save and load after you have the skis off. It will make you stop skiing. I reported this a week or so ago, but haven't checked if it is still in the bugfix version or not.

It's fixed now in the latest version that was released two seconds ago - downloadable from the game homepage.