[File] Identifying Microsoft XPS (XML Paper Specification) / Improve .zip container detection

[Christos Zoulas]

Yup, adding code to list the zip directory would be helpful!

christos

> On May 15, 2026, at 4:20 PM, Christoph Biedl <astron.com.bwoj at manchmal.in-ulm.de> wrote:
> 
> Debian bug report: https://bugs.debian.org/1134126
> This also has links to test samples.
> 
> Long story short, this is yet another file format using .zip as
> a container. Sometime the ooxml detection hits for "[Content_Types].xml"
> being the first item - it the order is different, file(1) falls back to
> "Zip archive data".
> 
> Now I cannot see how to handle this with plain magic in a robust way but
> perhaps somebody else has ideas.
> 
> Otherwise this makes me think - possibly not for the first time -  file
> should eventually become able to use the file listing of a .zip file for
> identification - parsing in the binary data like in magic/Magdir/msooxml
> looks scary and is fairly fragile.
> 
>    Christoph
> 
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