https://bugs.documentfoundation.org/show_bug.cgi?id=169072
Bug ID: 169072
Summary: FILESAVE PPTX File fails to open in PP again,
difference between UI and convert-to
(forum-mso-de-38427.ppt)
Product: LibreOffice
Version: 6.2.8.2 release
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: filters and storage
Assignee: [email protected]
Reporter: [email protected]
Blocks: 104787
Created attachment 203551
--> https://bugs.documentfoundation.org/attachment.cgi?id=203551&action=edit
forum-mso-de-38427.ppt
Open and save the attached file, forum-mso-de-38427.ppt, to PPTX and try
opening it in PowerPoint, it will fail.
Interestingly, when converting using convert-to with a command something like
the following, the result is OK:
soffice.exe --convert-to pptx forum-mso-de-38427.ppt
The meaningful difference between the files is in '_rels/.rels' after
unzipping, where the convert-to result has this:
<Relationship Id="rId1"
Type="http://schemas.openxmlformats.org/officedocument/2006/relationships/metadata/core-properties";
Target="docProps/core.xml"/>
While after saving from the UI as PowerPoint 2007-365 (*.pptx) format, it has
the following:
<Relationship Id="rId1"
Type="http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties";
Target="docProps/core.xml"/>
When saving using the UI, there's another format, Office Open XML Presentation
(*.pptx), this also produces a working file, and the relationship type URI is
the same as in the convert-to case.
What's interesting is that PowerPoint also exports this part like the "bad"
PowerPoint 2007-365 (*.pptx) format from the UI, and of course it's able to
read the file back, which means there must be other relevant differences:
<Relationship Id="rId2"
Type="http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties";
Target="docProps/core.xml"/>
Observed with LO 26.2.0.0.alpha0+ (8ea8e254a3151f5390f3a10ff156fcaf8e7c5d5c) /
Windows.
In latest of 5.2 Windows bibisect repo the export is OK, in 5.3 there is a
likely unrelated change, causing validity issues (caught by OOXML-Validator),
and when that disappears in 6.2, the file remains invalid (though
OOXML-Validator shows no validity issues). Probably not worth chasing, and
instead best to investigate this independently.
Since exporting most presentations to PPTX is OK in Impress, it might be
interesting what detail of this presentation matters.
Based on the initial observation (UI vs. --convert-to), bug 165180 might be
relevant.
Attaching PPTX exported by PowerPoint 2013 for reference, both the regular,
transitional and strict ones.
Referenced Bugs:
https://bugs.documentfoundation.org/show_bug.cgi?id=104787
[Bug 104787] [META] Saved PPTX files that MS Powerpoint can't open
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