unzip failure with files that contain colons

[Thomas Wolff]

Am 15.06.2022 um 20:30 schrieb Adam Dinwoodie:
> Cygwin generally handles filenames with colons just fine, by mapping the
> character to some higher Unicode character and remapping on the fly.
> However Cygwin's `unzip` appears to have a bug: when unzipping an
> archive that contains a filename with a colon, it replaces the colon
> with an underscore.
>
> cygcheck.out and simple test script attached; expected behaviour from
> running `bash unzip-bug.sh` is that you get an empty file called `a:b`,
> but on Cygwin you instead get an empty file called `a_b`.
It's an explicit #ifdef __CYGWIN__ in upstream unzip, file unix/unix.c, 
which transforms a bunch of characters.
If I uncomment most of them (except \), all unpack fine:
x0:z  x1<z  x2>z  x3|z  x4"z  x5?z  x6*z

Someone should report upstream please.
Thomas