[dvipdfmx] Status of gzipped (e)ps support

[Phelype Oleinik]

Dear dvipdfmx team,

What is the current status of the support for gzipped PostScript
graphics files in dvipdfmx?  Currently neither including the file
directly nor using |`gunzip -c| seems to work.  I get fatal errors with
both

    \special{PSfile="miau.ps.gz"} \end

and

    \special{PSfile="`gunzip -c miau.ps.gz"} \end

(you can get |miau.ps| from the latex2e repo [1] or any other PostScript
file will do).

Are these intentionally unsupported, or is there a bug with one of them?

Best,
Phelype

 [1]: https://github.com/latex3/latex2e/blob/main/required/graphics/testfiles/support/miau.ps