Re: jar files won't open in emacs 27.1 on debian 11.6 "bullseye"

[Steinar Bang]

>>>>> Eli Zaretskii <eliz@gnu.org>:

> You need to "M-x load-file RET arc-mode.el.gz RET" before "C-u M-x" of
> the function.  The Emacs will stop in the function.

Ok, archive-zip-summarize looks for the magic sequence "PK\005\006" or
"PK\006\007" or "PK\006\006" or "PK\001\002".

But what this jar file starts with, is "PK^c^d", which I think is
"PK\003\004", which is non of the above.

I.e. archive-zip-summarize doesn't recognize the magic number of these
jar files.