Cheers - I grabbed it from GitHub. I also discovered (after I posted last night) that the default Files app has some zip/compression functionality - you can browse into a zip and see contents and extract or copy it. Likewise you can compress stuff. I’m assuming this is all just standard zip functionality and doesn’t necessarily support 7zip, RAR or other compression formats - but still good to know. If it does then ZipXtract may be semi-redundant.
Also as noted int he thread below, your suggestion of…
…also has the exact same functionality as default Files so as noted I suspect they are one and the same, with just a changed icon (i.e. inverted fro the iodé version)? So that also has some zip/compression capability.