I am exporting e.g. a presentation document to HTML via API. I set the
Overwrite property like this:
-----%<-----
// XStorable to save document later
XStorable xStorable = (XStorable)
        UnoRuntime.queryInterface(XStorable.class, this.xComponent);

// Set properties for conversions
PropertyValue[] conversionProperties = new PropertyValue[2];
conversionProperties[0] = new PropertyValue();
conversionProperties[0].Name = "Overwrite";
conversionProperties[0].Value = new Boolean(true);
conversionProperties[1] = new PropertyValue();
conversionProperties[1].Name = "FilterName";
conversionProperties[1].Value = "impress_html_Export";
        
// Convert
String convertedTargetFileName = "file:///tmp/test.html";
try {
      	xStorable.storeToURL(convertedTargetFileName, conversionProperties);
} catch (IOException ignore) {}
-----%<-----
The HTML export consists of several files. The main
file (presentation.html) is really overwritten while other files
(text0.html and img0.jpg) are not overwritten. Instead a message appears
that asks me to overwrite. Well, if I set the Overwrite option, I really
want to overwrite and I don't want to be asked again, especially if the document
is opened in hidden mode!