Double Click on Folders Brings Up Search

This problem occurs when you alter the "Drive" / "File Folders" entries via File Types dialog, to add a "Command Prompt here" or "Print Directory" feature for drives / folders. (example)

http://support.microsoft.com/?kbid=321379.
http://support.microsoft.com/?kbid=321186.

Resolution:

Click Start/Run and type:

regsvr32 /i shell32.dll

-or-

Fix "Search" Opens Instead of Explorer.

-or-

Click Start/Run and type:

reg add hkcr\directory\shell /ve /d none /f

-or-

To fix this manually via registry:

If this problem is seen for Drives:

HKEY_CLASSES_ROOT\Drive\shell

Set (default) to "none" (without ")

If this problem is seen for folders:

HKEY_CLASSES_ROOT\Directory\shell

Set (default) to "none" (without ")