I don't know how it happened, but when I right-click on a folder, the "open" action doesn't show up any more. Instead of this, I have the default action set to "Read with windows player".
How can I recover the "open" action ?
Windows 7 Explorer will now open Documents or Computer directly, skipping and bypassing Libraries, depends on what you set or configure on initial run. There are more special objects and folders that Windows Explorer can open directly to.
Open My Computer window. • Click Tools, Folder Options, then click File Types.
• From the list, locate the entry FOLDER with extension of (NONE).
• Click Advanced, select Explore, then Set Default
• Click OK and close the dialog. To accomplish this via the Registry: •Open Regedit.exe and navigate to: HKEY_CLASSES_ROOT\Folder\shell
•In the right pane, set the value of (default) to explore