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I stumbled on your project while looking for something else and I thought I should take a minute to point out that changing MultipleInvokePromptMinimum to a different value will impact every context menu that has not declared a MultiSelectModel in it's verb, along with all the ones that declared "MultiSelectModel"="Document" in their verb.

The solution you are looking for, that only affects your own context menu, is a registry entry named MultiSelectModel. It has 3 possible values, "Single", "Document" or "Player".

"MultiSelectModel"="Document" is default, and once the number of items selected is greater than the value in set in MultipleInvokePromptMinimum (usually 15), the menu is not shown.

If you want your context menu to be shown when the number of items selected items is greater than the value set in MultipleInvokePromptMinimum, all you need to do is to set "MultiSelectModel"="Player" on your verb.

[HKEY_CLASSES_ROOT\YourProgId\shell\YourVerb]
@="My Verb Text"
"MultiSelectModel"="Player"
[HKEY_CLASSES_ROOT\YourProgId\shell\YourVerb\command]
@="YourApp.exe"

ref: https://docs.microsoft.com/en-us/windows/desktop/shell/how-to-employ-the-verb-selection-model

In the CopyApp, function

SHDocVw.ShellWindows() 

only returns open Explorer windows, but not the Desktop.
In user32.dll there is a function GetDesktopWindow() which returns handle to the desktop. Unfortunately we couldn't get "IShellFolderViewDual2" or "InternetExploer" object from the handle.
Extensive search for solution in last two months yielded no results.

This issue can be "mitigated" by user by opening the Desktop as a Explorer window.