for your first question, if you aer using Non-sequental Mode then you could find MEMs directly under the NS object list, The DLL version is used in sequential mode alone! hsl8@=_ B W$3p,VTMmB For your 2nd Q, like the upstairs's reply, the STEP files should be saved under ZEMAX\Objects\CAD Files. z!1j8o2 }:BF3cH> 0 Hope this would help :)
