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Steps to Unlock & Unhide Windows 7 hidden locked Themes
1. Press the "window" button + "R" key to open the RUN command window.
2. Copy and paste this there : C:\Windows\Globalization\MCT.
3. Open a MCT-(AU, CA, GB, US, or ZA) folder for the regional theme that you want.
NOTE: AU, CA and ZA regions all have the same themes though.
4. Open the Theme folder in the selected region folder.
5. Select the .theme file to use it.
NOTE: Once you select a .theme file, Windows 7 will save it so that you will be able to change or select this theme again from within the normal Personalization window location.
6. Hide the Windows 7 System and Protected Operating System files.
7. Enjoy your new regional themes!!
Posted By Ashwin Kak