File Types and the Registry
As you might expect, everything Windows 8 knows about file types is defined in the Registry. (See Chapter 29, “Editing the Windows Registry,” for the details on understanding and using the Registry.) Open the Registry Editor (in the Start screen, type regedit, press Enter, and enter your UAC credentials) and examine the HKEY_CLASSES_ROOT key. Notice that it’s divided into two sections:
• The first part of HKEY_CLASSES_ROOT consists of dozens of file extension subkeys (such as .bmp and .txt). There are well over 400 such subkeys in a basic Windows 8 installation, and there could easily be two or three times that number on a system with many applications installed.
• The second part of HKEY_CLASSES_ROOT lists the various ...
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