IconHandler
This key points to a program that dynamically generates an icon??”
usually a preview of the contents of the file??”to be used instead of a
static icon. See ???Change the Icon for All Files of a Type,??? earlier in this
chapter, for details.
PropertySheetHandlers
These extensions add extra pages (tabs) to the window that appears
when you right-click a file of this type and select Properties.
Of course, the keys in the shellex branch aren??™t always so neatly organized;
sometimes you??™ll find keys named for a Class ID, with another Class ID in its
(Default) value. See ???Search the Registry,??? earlier in this chapter, for some
tools you can use to help track down Class IDs.
??”continued??”
File Type Associations | 139
The Registry One of the most useful features of File Type Doctor is the Lock feature,
described next.
Lock Your File Types
Tech companies used to spend millions trying to get you to buy their products
(OK, they still do), but now the race is on to be ???the default.??? Microsoft
wants its Live Search web site to be the default search engine in IE, and Google
sued Microsoft to try to prevent this before Windows Vista shipped.
Companies pay PC manufacturers to preinstall trial versions of their software
on all their machines so their products can be the default. And when
you install an application on your PC, the installer invariably makes the new
program the default for all the file types it supports.
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