ZIP files: keep a shared bundle organised and handle it carefully
ZIP is useful for sharing a set of files as one bundle while retaining names and organisation. Successful delivery does not prove that the set is complete or that the recipient can open every item. Inspect the contents, not only the archive name.
Packaging and compression do not promise secrecy
A ZIP can contain compressed or uncompressed entries. Programs differ in their supported compression and encryption methods. The .zip extension alone implies neither password protection nor universal compatibility.
References: Python Documentation — ZIP Archives and Decompression Pitfalls
Before and after sharing
Gather the intended versions in a clear folder, removing obsolete copies and unnecessary private files before creating the archive. Use distinguishable names rather than different files with the same name in one location.
After creation, inspect the contents list and extract a test copy into a new folder. Compare names and file counts, then open a sample of each important type. For a final document handoff, check the version, not merely its presence.
Receiving an unfamiliar archive
Compressed size does not cap extracted size. ZIP documentation highlights memory, storage, pathname and unsupported-method limitations. Rejecting excessive expansion or unsafe structure can therefore be a legitimate protection.
Check the source and contents, and do not run an executable merely because it arrived inside ZIP. If extraction fails, verify download completeness and supported methods; do not repeatedly enter a confidential password into unfamiliar websites.
References: Python Documentation — ZIP Archives and Decompression Pitfalls
Example: a small delivery bundle
The bundle contains notes.txt, images/front.png and images/back.png. Expect three files; images is a folder, not a fourth file.
After extraction, open the notes and both pictures and check that front and back contain the intended views. This tests meaning and organisation. Archive integrity alone cannot tell which picture you intended to call the front view.