Call windows explorer shell extension

Question

Is there any way of calling a DLL that is a shell extension programmatically? We use a software that registers a shell extension on windows explorer, and I need to call one of the items available on its context menu. I do not have the software source code that I want to call.

EDIT

This context menu only appears when I select a PDF file on windows explorer. So i need to call it passing a dll file.

EDIT

Registry information:

[HKEY_CLASSES_ROOT\CLSID{2DC8E5F2-C89C-4730-82C9-19120DEE5B0A}] @="PDFTransformer3.PDFTContextMenu.1"

[HKEY_CLASSES_ROOT\CLSID{2DC8E5F2-C89C-4730-82C9-19120DEE5B0A}\InprocServer32] @="C:\Program Files\ABBYY PDF Transformer 3.0\PDFTContextMenu.dll" "ThreadingModel"="Apartment"

[HKEY_CLASSES_ROOT\CLSID{2DC8E5F2-C89C-4730-82C9-19120DEE5B0A}\ProgID] @="PDFTransformer3.PDFTContextMenu.1"

[HKEY_CLASSES_ROOT\CLSID{2DC8E5F2-C89C-4730-82C9-19120DEE5B0A}\Programmable]

[HKEY_CLASSES_ROOT\CLSID{2DC8E5F2-C89C-4730-82C9-19120DEE5B0A}\VersionIndependentProgID] @="PDFTransformer3.PDFTContextMenu"

EDIT

Is it possible to call ShellExecuteEx with the verb i want (not the default one)? If so, how do I call the verb I want (which uses the DLL)?

Thats the verb i wanna call for a PDF file:

Answer 1

The DLL is evidently a context-menu extension. If you want to call it the same way the shell does, then you want to host the IContextMenu interface that the DLL implements. Several years ago, Raymond Chen wrote an extensive series on this topic:

How to host an IContextMenu

1. Initial foray
2. Displaying the context menu
3. Invocation location
4. Key context
5. Handling menu messages
6. Displaying menu help
7. Invoking the default verb
8. Optimizing for the default command
9. Adding custom commands
10. Composite extensions - groundwork
11. Composite extensions - composition

The first two articles are the most important. They introduce how to get the IContextMenu interface of a file in the first place, and then how to invoke one or more of the commands offered by that menu. Essentially, get the IContextMenu interface, fill a CMINVOKECOMMANDINFOEX structure, and then pass it to the interface's InvokeCommand method. The articles call TrackPopupMenu to display a menu to the user, and then use the selection to fill the structure, but if you already know exactly which command you want to run, then you can forgo displaying the menu. (You might still have to create the menu, though, since the IContextMenu object probably expects to have QueryContextMenu called on it first.)

Answer 2

Rafael, you can use the IContextMenu Interface. from here you can enumerate the entries returned by the interface and then execute the option which you want using the InvokeCommand