You need to edit the registry because the one in "folder options" doesn't let you to look the function in details (The "Edit" button is greyed out).
First try to delete the "open" option. Then restart. Try to add "open" again, see if it works.
If not, you need to edit registry.
Warning: Incorrectly modifying the registry can cause serious problems that may require you to reinstall your operating system. Do it at your own risk.
If you don't wish to edit registry yourself, I can send you a *.reg which can help you to modify it. Leave your email address if you wish to get.
Open in the same window
Step 1:
- Open registry by "Start | Run | Type "regedt32"
- In "HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Directory\shell", add:
…\SameWindow
- Double click "Default", type the name(description) of the new function (eg "Open in the same window")
Step 2:
- In "HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Directory\shell\NewWindow, add:
…\Command
- Double click "default", type "explorer.exe"
Step 3
- Go to "Window Explorer| Tools | Folder Options | File Types | File Folder"
Select "Open in the same window" as default.
Then you should be able to double-click and open in the same folder.
Hope it helps.