For what it's worth, this is documented somewhat in Cocoa Scripting Guide: How 
Cocoa Applications Handle Apple Events – Apple Events Sent by the Mac OS – Open 
Contents.
https://developer.apple.com/library/mac/documentation/cocoa/conceptual/ScriptableCocoaApplications/SApps_handle_AEs/SAppsHandleAEs.html#//apple_ref/doc/uid/20001239-1121328

Cheers,
Ken

On Dec 21, 2013, at 5:22 PM, Andy Lee wrote:

> To answer my own question, it looks like it's done by implementing a Service. 
>  I've gotten it working in a quick scratch application.
> 
> --Andy
> 
> On Dec 21, 2013, at 6:06 PM, Andy Lee <ag...@mac.com> wrote:
> 
>> I know how to accept files that are dragged from Finder to the application 
>> icon.  It's a matter of adding some settings to Info.plist and implementing 
>> the application:openFiles: application delegate method.
>> 
>> This does not work for dragging URLs from a web browser -- for example, 
>> dragging from Safari's URL field, or dragging an image being displayed in 
>> Safari to the dock icon.  What happens is, my application:openFiles: method 
>> is never called, and the URL is given back to Safari to reload.
>> 
>> Yet it is clearly possible for applications to accept dragging of URLs to 
>> their Dock icons, because it works for other browsers.  What are those other 
>> browsers doing?
>> 
>> I tried using a custom contentView for the dock tile, and having that view 
>> be a drag destination (call registerForDraggedTypes: and implement 
>> NSDraggingDestination methods).  But that didn't make any difference.
>> 
>> --Andy
> 
> 
> 
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