moi won't start with double-clicking a 3dm file

 From:  wimverbe
7646.1 
this is a minor thing, but a bit uncomfortable anyway. when double-clicking a .3dm file, MoI launches, then I get the message "file not found" in an ugly (pardon my french) windows style tiny window, then MoI quits again. Dropping a .3dm file on the MoI program icon gives the same result. I can only open an existing file by opening it from within MoI.

Moi V3, OSX 10.10.4

tnx
wim