DragAcceptFiles Working in 9926 But Not Working In 10049 and 10061

My company has a software product that accepts dragged items. In all versions of Windows from XP through Windows 10 build 9926 that functionality has worked fine. However, with build 10049 (possibly 10041 which I did not test thoroughly before
going to 10049) and now 10061 that functionality stopped working. The application calls DragAcceptFiles to enable drag drop messages. In addition, either ChangeWindowMessageFilter is called on Vista or ChangeWindowMessageFilterEx is called on Windows
7 and higher for the messages WM_DROPFILES, WM_COPYDATA, and WM_COPYGLOBALDATA. This was working fine on Windows 10 build 9926. Now when I attempt to drag an item to our software product, I get the "Don't" symbol (circle with line through
it) and no WM_DROPFILES messages are received. The application is unchanged with only an upgrade to the Windows 10 build performed. As a sanity check, I created a brand new VM yesterday running build 9926 and the functionality worked fine. I
then upgraded to 10049 and it stopped working. This morning I upgraded to 10061 and it is still broken. Is there are new filter or restriction in place since build 9926 that would be stopping the traditional drag drop procedure from working? This
is very frustrating because there is a dearth of information on Windows 10 API changes and since this appears to be some kind of recent change, I am out of ideas of where to look for answers. I can duplicate this problem on the older platforms by simply
calling DragAcceptFiles with the second parameter set to false. In that case, on Windows 7 for example, I will get the "Don't" symbol.
When drag drop is working fine, the WM_DROPFILES message is received and processed using DragQueryFile to get the number of files to be transferred and the names of those files. That is then followed by DragFinish to complete the operation.

Hi,
Since this issue is related to the desktop application development, I recommend you post it in the following forum
MSDN---Application compatibility for Windows Desktop Development
https://social.msdn.microsoft.com/Forums/windowsdesktop/en-US/home?category=windowsdesktopdev
Regards
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]

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My company has a software product that accepts dragged items. In all versions of Windows from XP through Windows 10 build 9926 that functionality has worked fine. However, with build 10049 (possibly 10041 which I did not test thoroughly before going
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