With a recent installation of Leap 15, somehow the EFI folder for Microsoft was wiped - or it was never in the correct location to start with.
The link below worked best - unfortunately you do need to use a Windows installation disk to get to the rescue option.
Just one point to be added: the "\Microsoft\Boot\" folders were not present in the EFI partition and thus the "bcdboot c:\Windows /l en-US /s b: /f All" command failed.
Use mkdir to create the directories. All else should work.
https://www.tenforums.com/bsod-crashes-debugging/24959-bsod-boot-0xc0000034.html
