If you need to drag and drop files into a running Application, here is your solution.
Only for Windows
» This asset uses UnityWindowsFileDrag-Drop under MIT License; see Third-Party Notices.txt file in package for details
» This is a modified version of Mark Göbel's (Bunny83) "UnityWindowsFileDrag-Drop" Project on Github.
You can find the original here:
UnityWindowsFileDrag-Drop on GitHub
» I have added Unity specific convenience methods and events that you can subscribe to.
