over at https://github.com/mcmilk/7-Zip-zstd a codec package is offered, expanding 7-zip functionality by adding zstandard:
You can install it in two ways:
complete setup with additions within the GUI and a modified Explorer context menu
only the codec plugin that goes to your existing 7-Zip installation (no GUI changes and no additional Hashers)
now i have been trying to get 7-zip portable running with the additional zstd.dlls, unfortunately without any luck so far.
is it possible to add these codecs to the portableapps 7-zip tool?