The entries in the TrueType subkey describe options that affect the use and display of TrueType fonts in Windows-based applications. This is the Registry path:
HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\TrueType
The TrueType subkey can contain the following entries:
TTEnable REG_SZ Boolean
Controls whether TrueType fonts are available. Setting this value to 1 makes TrueType fonts available in your Windows-based applications. Setting this value to 0 turns off TrueType fonts so they are unavailable in applications.
Default: 1
TTonly REG_SZ Boolean
Specifies whether to make only TrueType fonts available in Windows-based applications. If this value is set to 1, only TrueType fonts are available. If this value is set to 0, all fonts installed on your system are available. To change this entry, choose the Fonts icon from Control Panel.
Default: 0