Turn on gzip compression option from the command line export

The gzip is a type of compression on the mi files , if you would like to add it to the mi command line exporter. you would need to do the following.

Add a line like this to miRenderer.xml to enable the behavior:

mel n="compression" s='$opt +=" -compression %1"' p="1" t="int" h="Enter compression level 0=none, 9=lots"/

Note: Add it in the "Export" (after the line that has <sep desc="Export:"/>) section.