open https://gitlab.synchro.net/main/sbbs/-/issues/928

libarchive and zlib don't support legacy (pre-DEFLATED) ZIP compression methods. But it can be done:

https://www.hanshq.net/zip2.html
https://github.com/jsummers/oldunzip/

This would allow the extraction and viewing or subsequent download of archived files from legacy ZIP files.

Whether this is done as a patch to zlib or libarchive or something internal to sbbs, it seems totally doable.
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https://gitlab.synchro.net/main/sbbs/-/issues/928#note_7201

It looks like the libarchive team would be willing to consider implementing implode/explode if someone were to submit it so maybe that's the place for it?

https://github.com/libarchive/libarchive/issues/2365
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