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<div class="memdoc"><dl compact><dt><b>Abstract method:</b></dt><dd>This method is abstract and can be overridden but not called directly.</dd></dl><p>Opens an archive for reading or writing.
Called by open.
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<tr><td></td><td valign="top"><em>mode</em>&nbsp;</td><td> may be QIODevice.ReadOnly or QIODevice.WriteOnly
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