Hallo Stephan,
das Entpacken hat jetzt mit 7 Zip geklappt und ich konnte die Conten..xml mit Notepad++ öffnen.
Hier der Anfang des html: um dort den fehler zu beseitigen, fehlen mir die Kenntnisse.
.Versuch mit 7 Zip Nach Öffnen der Content.xml mit Notepad+
<?xml version="1.0" encoding="UTF-8"?>
<office:document-content xmlns:office="urn:oasis:names:tc:opendocument:xmlns

1.0" xmlns:style="urn:oasis:names:tc:opendocument:xmlns:style:1.0" xmlns:text="urn:oasis:names:tc:opendocument:xmlns:text:1.0" xmlns:table="urn:oasis:names:tc:opendocument:xmlns:table:1.0" xmlns:draw="urn:oasis:names:tc:opendocument:xmlns:drawing:1.0" xmlns:fo="urn:oasis:names:tc:opendocument:xmlns:xsl-fo-compatible:1.0" xmlns:xlink="
http://www.w3.org/1999/xlink" xmlns:dc="
http://purl.org/dc/elements/1.1/" xmlns:meta="urn:oasis:names:tc:opendocument:xmlns:meta:1.0" xmlns:number="urn:oasis:names:tc:opendocument:xmlns:datastyle:1.0" xmlns:svg="urn:oasis:names:tc:opendocument:xmlns:svg-compatible:1.0" xmlns:chart="urn:oasis:names:tc:opendocument:xmlns

1.0" xmlns:dr3d="urn:oasis:names:tc:opendocument:xmlns:dr3d:1.0" xmlns:math="
http://www.w3.org/1998/Math/MathML" xmlns:form="urn:oasis:names:tc:opendocument:xmlns:form:1.0" xmlns:script="urn:oasis:names:tc:opendocument:xmlns:script:1.0" xmlns:ooo="
http://openoffice.org/2004/office" xmlns:ooow="
http://openoffice.org/2004/writer" xmlns:oooc="
http://openoffice.org/2004/calc" xmlns:dom="
http://www.w3.org/2001/xml-events" xmlns:xforms="
http://www.w3.org/2002/xforms" xmlns:xsd="
http://www.w3.org/2001/XMLSchema" xmlns:xsi="
http://www.w3.org/2001/XMLSchema-instance" xmlns:rpt="
http://openoffice.org/2005/report" xmlns:of="urn:oasis:names:tc:opendocument:xmlns:of:1.2" xmlns:xhtml="
http://www.w3.org/1999/xhtml" xmlns:grddl="
http://www.w3.org/2003/g/data-view#" xmlns:tableooo="
http://openoffice.org/2009/table" xmlns:textooo="
http://openoffice.org/2013/office" xmlns:field="urn:openoffice:names:experimental:ooo-ms-interop:xmlns:field:1.0" office:version="1.2"><office:scripts/><office:font-face-decls><style:font-face style:name="OpenSymbol" svg:font-family="OpenSymbol"/><style:font-face style:name="StarSymbol" svg:font-family="StarSymbol"/><style:font-face style:name="verdana" svg:font-family="verdana, arial, sans-serif"/><style:font-face style:name="Segoe UI" svg:font-family="'Segoe UI'" style:font-family-generic="swiss"/><style:font-face style:name="Courier New1" svg:font-family="'Courier New'" style:font-family-generic="modern" style:font-pitch="fixed"/><style:font-face style:name="Courier New" svg:font-family="'Courier New'" style:font-adornments="Normal" style:font-family-generic="modern" style:font-pitch="fixed"/><style:font-face style:name="Courier New3" svg:font-family="'Courier New'" style:font-family-generic="swiss" style:font-pitch="fixed"/><style:font-face style:name="Segoe UI2" svg:font-family="'Segoe UI'" style:font-family-generic="swiss" style:font-pitch="fixed"/><style:font-face style:name="Courier New2" svg:font-family="'Courier New'" style:font-family-generic="modern" style:font-pitch="variable"/><style:font-face style:name="Times New Roman4" svg:font-family="'Times New Roman'" style:font-family-generic="modern" style:font-pitch="variable"/><style:font-face style:name="Times New Roman" svg:font-family="'Times New Roman'" style:font-family-generic="roman" style:font-pitch="variable"/><style:font-face style:name="Times New Roman2" svg:font-family="'Times New Roman'" style:font-adornments="Normal" style:font-family-generic="roman" style:font-pitch="variable"/><style:font-face style:name="Times New Roman1" svg:font-family="'Times New Roman'" style:font-adornments="Standard" style:font-family-generic="roman" style:font-pitch="variable"/><style:font-face style:name="Albany" svg:font-family="Albany" style:font-family-generic="swiss" style:font-pitch="variable"/><style:font-face style:name="Arial" svg:font-family="Arial" style:font-family-generic="swiss" style:font-pitch="variable"/><style:font-face style:name="Segoe UI1" svg:font-family="'Segoe UI'" style:font-family-generic="swiss" style:font-pitch="variable"/><style:font-face style:name="Times New Roman3" svg:font-family="'Times New Roman'" style:font-family-generic="swiss" style:font-pitch="variable"/><style:font-face style:name="Arial1" svg:font-family="Arial" style:font-family-generic="system" style:font-pitch="variable"/><style:font-face style:name="DejaVu Sans" svg:font-family="'DejaVu Sans'" style:font-family-generic="system" style:font-pitch="variable"/><style:font-face style:name="SimSun" svg:font-family="SimSun" style:font-family-generic="system" style:font-pitch="variable"/></office:font-face-decls><office:automatic-styles><style:style office:name="__Annotation__7124_34336010111111111111111111111111111111111111111111111111111111111111111111111" office:name="__Annotation__7208_34336010111" style:name="E-Book-Plattformen" style:family="table"><style:table-properties style:width="14cm" table:align="margins"/></style:style><style:style style:name="E-Book-Plattformen.A" style:family="table-column"><style:table-column-properties style:column-width="4.665cm" style:rel-column-width="21839*"/></style:style><style:style style:name="E-Book-Plattformen.B" style:family="table-column"><style:table-column-properties style:column-width="6.999cm" style:rel-column-width="32763*"/></style:style><style:style style:name="E-Book-Plattformen.C" style:family="table-column"><style:table-column-properties style:column-width="2.335cm" style:rel-column-width="10933*"/></style:style><style:style style:name="E-Book-Plattformen.A1" style:family="table-cell"><style:table-cell-properties fo:padding="0.097cm" fo:border-left="0.002cm solid #000000" fo:border-right="none" fo:border-top="0.002cm solid #000000" fo:border-bottom="0.002cm solid #000000"/></style:style><style:style style:name="E-Book-Plattformen.C1" style:family="table-cell"><style:table-cell-properties fo:padding="0.097cm" fo:border="0.002cm solid #000000"/></style:style><style:style style:name="E-Book-Plattformen.A2" style:family="table-cell"><style:table-cell-properties fo:padding="0.097cm" fo:border-left="0.002cm solid #000000" fo:border-right="none" fo:border-top="none" fo:border-bottom="0.002cm solid #000000"/></style:style><style:style style:name="E-Book-Plattformen.C2" style:family="table-cell"><style:table-cell-properties fo:padding="0.097c
Das ist der Anfang des XML-Files. Wenn du mal einen Blick werfen würdest, wäre ich sehr dankbar.