mholt/archives

Support for multi-part ZIP files

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#66 opened on Apr 24, 2026

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enhancementhelp wanted

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Description

What would you like to have changed?

Add support for unzipping archive files (other than RAR) that are split into multiple parts

Why is this feature a useful, necessary, and/or important addition to this project?

Usually, zip files that are sent over emails are split into multiple part in order to avoid size limit on attachments. In order to unzip them, we need to put all of the parts together. Usually these files are ordered by their number on their extension, for example: .zip, .z01, .z02, etc.

What alternatives are there, or what are you doing in the meantime to work around the lack of this feature?

For now, I use MacOS's native zip and unzip command, which is provided by libzip. I usually use these command in order to unzip them:

zip -s- img-pt.zip -O combined.zip
unzip combined.zip

Also, I found an alternative command using 7zip:

7z x img-pt.zip

Please link to any relevant issues, pull requests, or other discussions.

I notice that we already supports unarchiving RAR files that are split into multiple files: https://github.com/mholt/archives/issues/20

Also, bodgit/sevenzip already supports for unarchiving multiple ZIP files: https://github.com/bodgit/sevenzip/issues/2

Contributor guide

Research direction
Examine existing ZIP libraries that support multi part archives, such as bodgit/sevenzip, and integrate with the archives library's interface. Implement scanning for .zip, .z01, .z02, etc. files and reassemble them for extraction.
Tech stack
go
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Goarchive/zip understanding
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50