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! ]46h!@~aC 3r~8:F"g For your 2nd Q, like the upstairs's reply, the STEP files should be saved under ZEMAX\Objects\CAD Files. S Qmn*CW b `P6Ox3 Hope this would help :)
