IE temporary files of wbk###.tmp

Does anybody know what IE temporary files of the format wbk###.tmp may be 
associated with? The ### is a number, but might also be hexadecimal - not just 
0-9.


 Glenn S. Dardick, Ph.D.
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 gdardick@dardick.net
 
 Assistant Professor of Information Systems
 Longwood University
 dardickgs@longwood.edu
 
 Director, Association for Digital Forensics, Security and Law
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 Editor, Journal of Digital Forensics, Security and Law
 http://www.jdfsl.org

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