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! )AEtW[~D " ;Cf@}i> For your 2nd Q, like the upstairs's reply, the STEP files should be saved under ZEMAX\Objects\CAD Files. a/s5Oit2'X bD/ ZKvg Hope this would help :)
