You can create a file without a File Type Extension in Windows 11/10 by carefully following the steps laid down in this post.

File History is a useful feature in the Windows 11/10 operating system. This feature makes automatic backup versions of important files on a computer to internal or external storage on a computer.

But if you do have problems booting up your computer as normal, a recovery USB drive can save your system and restore access to your files and apps.