> An error like that normally means your file isn't an OLE2 one. Is it
> possible that your file is in csv format, or xml?
>  

Yes, the Excel 2007 format is based upon XML. The format is called
Office OpenXML.
The specification was developed by Microsoft for its Microsoft Office
2007 product suite and was standardized
by Ecma International as Ecma 376 in December 2006. As far as I know,
it's not a ISO-Standard.

Office Open XML format uses a ZIP container for packaging XML and other
data files (like OpenDocument).
Microsoft has stated that its primary goal was backward compatibility
with existing documents and full support of the feature set of Microsoft
Office.  So the file isn't an OLE2 one and POI can't parse it. You have
to use a XML-Parser instead.
There is also a Project at sourceforge called openxml4j.  It is a Java
framework supporting Open Package Convention and Office Open XML File
Format (WordProcessingML, SpreadsheetML, PresentationML and shared specs
like DrawingML) but unfortunately it is just a Pre-Alpha.

Sorry for my bad english. I'm not a native speaker.

Greeting form Oldenburg (Germany)
Christian

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