Thanks.
However, I am not developing S3D anymore. If you really wish to empty the MRU, remove this block
Code:
<setting name="Mru" serializeAs="Xml">
... data for mru
</setting>
from this file:
C:\Users\[username]\AppData\Local\skwas\S3D_StrongName_gnaeuc52jjzfy2 lgwyxvotgztlpqs1qe\1.0.0.0\user.config.
Make sure S3D is closed when you do.