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! d[9c6C:<q 7O^ySy"l For your 2nd Q, like the upstairs's reply, the STEP files should be saved under ZEMAX\Objects\CAD Files. D6=Z%h\* F[BJhN*]a Hope this would help :)
