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! ~[HzGm%
;Z]Wj9iY
For your 2nd Q, like the upstairs's reply, the STEP files should be saved under ZEMAX\Objects\CAD Files. }R%H?&P
/'sv7hg+
Hope this would help :)