Windows Explorer Settings in Group Policy

I am trying to find the Group Policy setting in the Server 2003 Active Directory that checks whether users get to see the file extensions in Windows Explorer, so it can be set that the web design students can tell whether the file is .html or a .php file. There are users that dont have the Tools > Options available in Windows Explorer and they cant see the file extensions. I want to create an OU for the srudent sub-group and change the settings in that OU, so that the class only can see the file extensions. Can sometell tell me how to find this setting? Thanks.

You can try to take a look the below ADM template:

Code:

---

CLASS USER
CATEGORY "Windows Explorer Customization"
POLICY "Show file extensions of known file types"
KEYNAME "Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced"
VALUENAME "HideFileExt"
VALUEON NUMERIC 0
VALUEOFF NUMERIC 1
END POLICY
END CATEGORY

---

Just copy it into a notepad and save it with the extension .ADM. After that import it into the Group Policy Editor. Ensure to right click the category "Windows Explorer Customization" first and then select "View > Filtering and uncheck all "Only show" boxes.