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About Shell Extensions
Windows supports two groups of shell extensions. The first group are
registered for each type of file:
- Context menu handlers. They add items to the context menu for a particular file object. The context
menu is displayed when the user clicks a file object with mouse button 2.
- Icon handlers. They typically add instance-specific icons for file objects. They can also
be used to add icons for all files belonging to the same class.
- Data handlers. They provide a type-specific IDataObject interface to be passed to the OLE DoDragDrop function.
- Drop handlers. They provide type-specific drop behavior to files that can accept drag and
drop objects.
- Property sheet handlers. They add pages to the property sheet dialog box that the shell displays for
a file object. The pages are specific to a class of files or a particular file
object.
The second group of shell extensions are associated with file operations such
as move, copy, rename, and so on:
- Copy hook handlers. They are called when a folder object is about to be copied, moved, deleted,
or renamed. They can either allow or prevent the operation.
- Drag and drop handlers. They are context menu handlers that the system calls when the user drops an
object after dragging it to a new position.
The design of a shell extension is based on the OLE Component Object Model
(COM). The shell accesses an object through interfaces. An application implements
the interfaces in a shell extension dynamic-link library (DLL), which is
essentially an OLE in-process server DLL.
This overview explains how to create shell extensions and describes how the
shell interacts with them.
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