Reset Batch File Open Command for Windows 10

Awhile ago I attempted to change the default editor program for batch files to Notepad++ but instead set the default way to open it.
I've attempted:

https://social.technet.microsoft.com/Forums/office/en-US/fc2ca91d-5509-4c9b-92a5-5af19375e361/lost-bat-file-association

http://www.sevenforums.com/tutorials/19449-default-file-type-associations-restore.html

https://stackoverflow.com/questions/9520695/reassociate-batch-files-with-cmd-exe

and many others.

How might I resolve this?