Hi,
I also need to find out how to do this. It's an old topic but it still seems to be an issue.
I've read the articles that state Outlook provides CFSTR_FILECONTENTS & CFSTR_FILEDESCRIPTOR instead of the expected CF_HDROP, however if an email is dropped onto the Google search input field, they manage to pick up at least some info, therefore there must be something passed over.
Is there no way to get this info at least?