Can the Windows 'find file or folder' dialog be executed from within
Delphi,
if so, how ?

        Yea, wouldn't we all want to be able to do THAT !! I'm not sure if it can
be done. But if there is a key combination you want to execute from your
app then you could simulate it like this.

This solution pretends to hit "Window+F", is there a way to add Window+key
combinations to the system?
 

The simplest way I found is :
     Keybd_Event(VK_LWIN,0,0,0);
     Keybd_event(VkKeyScan('F'),0,0,0);
     Keybd_Event(VkKeyScan('F'),0,KEYEVENTF_KEYUP,0);
     Keybd_Event(VK_LWIN,0,KEYEVENTF_KEYUP,0);

another way is to use DDE but that involves a lot more code too