TrueLog Explorer supports custom handling of special content types and URL file extensions. You can add custom content-types and file extensions to some values in the Registry to change product behavior. The relevant settings can be found in the registry (HKEY_CURRENT_USER\Software\Silk\Silk TrueLog Explorer\15.5\).
These values contain lists of content-types and file extensions that need special handling. The Mask* values apply to textual data, which can be rendered as plain text in HTML view. The Suppress* values apply to binary (non-text) data, which can not properly be rendered.