[ktnef] [Bug 473691] New: KTnef 23.04.1 can not open winmail.dat, but Thunderbird is able to convert into text/plain

[Elmar Stellnberger]

https://bugs.kde.org/show_bug.cgi?id=473691

            Bug ID: 473691
           Summary: KTnef 23.04.1 can not open winmail.dat, but
                    Thunderbird is able to convert into text/plain
    Classification: Applications
           Product: ktnef
           Version: unspecified
          Platform: Mageia RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: estellnb at elstel.org
  Target Milestone: ---

used: ktnef-23.04.1-2.mga9, arch i686, Mageia 9
used: thunderbird-102.12.0-1.mga9, arch i686
used: tnef 1.4.18, commit 1810f3a 45459a2, arch i686, self-compiled
kernel: 6.3.9-desktop-1.mga9 #1 SMP PREEMPT_DYNAMIC Wed Jun 21 16:54:49 UTC
2023 i686

ktnef displays a GUI alert/message box that says "Opening file winmail.dat not
possible" (original text: "Das Öffnen der Datei „winmail.dat“ ist nicht
möglich."). KTnef will run and hold its main window open, but no file or
content appear to be displayed, although it says "winmail.dat - KTnef" in the
title bar. It is possible to make a "save message text to file" which results
in an empty file, zero bytes long. Viewing as ritch text says "no rtf in this
document" and opening ktnef without any command line parameter afterwards (i.e.
without winmail.dat) the file that was opened last (or not) isn´t viewed under
actual documents (which appears to be a list similar to last opened in
libreoffice-writer).

If you inspect winmail.dat with 'od' or 'vim -MR/:set wrap on', you don´t see
more than a few SMTP-headers. If you attach the winmail.dat within a
Thunderbird Email directly, it will be decoded into text/plain. Saving this
text/plain as .eml and opening it with Thunderbird again, you get an empty
Email with same or similar headers as the envelope had. The winmail.dat itself
was an attachement inside an attached .eml (as you will often encounter;
however in Σ a 3-time nest/wrap excluding the top-Email) and thus Thunderbird´s
only offer about it was saving to disk (or on my other machine opening it with
ktnef, which didn´t do the trick either).

  Here you can find the attachements: https://upload.elstel.info/corr/DKB-edr/
(ask-me42copy2this-report)
  Here is what the tnef command line program does (see at
https://github.com/verdammelt/tnef/issues/47):
> tnef --ignore-cruft -v [--list] -f winmail.dat
WARNING: garbage at end of file (ignored)
> no content extracted, no files listed

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