[okular] [Bug 470724] New: Okular can't save .cbz files as .okular on Windows

[Archenoth]

https://bugs.kde.org/show_bug.cgi?id=470724

            Bug ID: 470724
           Summary: Okular can't save .cbz files as .okular on Windows
    Classification: Applications
           Product: okular
           Version: 23.04.0
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Comicbook backend
          Assignee: okular-devel at kde.org
          Reporter: archenoth at gmail.com
  Target Milestone: ---

Created attachment 159505
  --> https://bugs.kde.org/attachment.cgi?id=159505&action=edit
The empty .okular file emitted from attempting to save a cbz file under Windows

SUMMARY
When attempting to save a .cbz file with annotations on Windows 11 as an
.okular file, the resulting file is blank (attached)

I can also confirm that following the same steps on Linux with the same version
of Okular and the same .cbz succeeds as expected, as does saving a .pdf as an
.okular file on Windows

STEPS TO REPRODUCE
1. Open a .cbz in Okular on Windows
(If you don't have one, zipping some PNGs and renaming the .zip to a .cbz
should do the trick!)
2. File -> Save As, and save as an .okular file

OBSERVED RESULT
An empty .okular file is produced

EXPECTED RESULT
An .okular file containing the saved document is produced, along with
annotations and other things like that!

SOFTWARE/OS VERSIONS
Windows: 11 Pro (10.0.22000 Build 22000)
KDE Frameworks Version: 5.105.0
Qt Version: 5.15.9

ADDITIONAL INFORMATION
I am using the version that was installed from the Microsoft Store here:
https://apps.microsoft.com/store/detail/okular/9N41MSQ1WNM8

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