ShellExecute() का आविष्कार करते समय, खुले क्रिया के बजाय एक्सप्लोर क्रिया का उपयोग करें: http://msdn.microsoft.com/en-us/library/bb762153%28VS.85%29.aspx ।
Edit: If you don't mean programmatically, open Windows Explorer, go to Tools -> Folder Options, select the File Types tab, locate the Folder entry in the list (not File Folder!), click Advanced, and set "explore" as default instead of "open".