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! 9ZFvN*Zf' KzD5>Xf]4$ For your 2nd Q, like the upstairs's reply, the STEP files should be saved under ZEMAX\Objects\CAD Files. jm9J-%? =+;1^sZ Hope this would help :)
