Use of QViewer: easily inspect and query the content of a single QVD. Check field values in different formats, search for records, etc. It's a QVD Tool. The alternative for tools like this is to create a QlikView document for each and every QVD.
QViewer is available as a free download (number of rows limited to 50000) or as a paid download. It is cheap and certainly worth the money.
Free version has the limit of 100,000 rows. If a QVD file has more rows then only first 100,000 will be loaded. IF you need more than that then you have purchase the license.
I think it is not required at all, you can load the qvd into Qlikview and you can see that data in Qlikview file itself.
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