1..dwp was the file extension used in version 2 of SharePoint and .webpart is a new extension used in version 3
2.version number on the xmlns attribute is different[2->2003, 3-> 2007]
3.The main difference is that all properties passed to the web part are specified with a property element and a name attribute in version 3. Version 2 uses different element names for everything.
Saturday, May 23, 2009
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