: It should contain the modified assets, a manifest file, and an installation guide. 3. Standards for "Proper" 7z Contents

: Do not dump files directly into the archive. Place everything inside one main folder so it doesn't clutter the user's directory upon extraction.

: Include a plain text file explaining what the files are, the version number, and contact info or a source link .

In many developer and engineering communities, filenames like k.n21 are used as shorthand for specific versions or hardware revisions.

Knowing if it's for a specific software, hardware (like a Chromebook N21), or a coding project would help me give you a much more precise description of what it should contain.