I don't know fervi, I just tested and I am able to extract and rezip an EGM using 7zip, though we use regular zip not the 7zip format.
Is the tree showing up blank? This happened the first time I did it because I accidentally placed the contents in a folder which was compressed to zip, you need to make sure the contents are TLD (top level directory). By which I mean if you open the egm/zip in an archive browser the files should be the first thing you see, not a folder that contains the files.
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