9660srv is the command you need from the Inferno dossrv(4) page.

On Fri, Mar 26, 2021 at 10:11 AM Ethan Gardener <eekee57@fastmail.fm> wrote:
On Fri, Mar 26, 2021, at 9:56 AM, saif.resun@outlook.com <mailto:saif.resun%40outlook.com> wrote:
> hello there!
>
> I want to extract an .iso file of plan9 operating system in Inferno system. Is there any command to do so?
% lookman cd-rom
man 4 dossrv # dossrv(4)

It's not actual extraction, but you can read & copy the files.

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