Add extention to windows explorer preview panel.

These steps allow windows to identify and display a file type in the Windows Explorer preview panel.

1. Start->Run->type regedit and press enter.
2. Open HKEY_CLASSES_ROOT\
3. Find the folder extension name ie .xml
4. If it doesn't exist then make it.
5. Create two keys by right mouse clicking in the folder, select new string value.
6. Name: Content Type
7. Value: text/plain
8. Name: PercievedType (one word no spaces).
9. Value: text