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! $@Fj_
N
a\MJbBXv
For your 2nd Q, like the upstairs's reply, the STEP files should be saved under ZEMAX\Objects\CAD Files. w5Xdq_e3
Kw|`y %~
Hope this would help :)