xlsx files from resource are considered as invalid

[MartinDelille]

I noticed that xlsx file stored in the resource file (qrc) are not properly handled by QXlsX:

QString fileName = ":/dummy.xlsx";
QXlsx::Document xlsx(fileName);
auto dimension = xlsx.currentWorksheet()->dimension();

if (!dimension.isValid()) {
    qCritical() << "Bad excel file:" << fileName;
}

Here is my corresponding qrc file:

<RCC>
    <qresource prefix="/">
        <file>dummy.xlsx</file>
    </qresource>
</RCC>