A. A. That was silly :-)
Fortunately this can be fixed with two simple commands which should be run from a command session (cmd.exe)
- From the Start menu select Programs and then Command Prompt (or select Run and enter cmd.exe)
- Enter the following commands:
ftype folder=%SystemRoot%\Explorer.exe /idlist,%I,%L
- Close the command session
The first command creates a new file type, folder, and the action associated with it. The second command creates the association between the "extension" and its file type.