A simple and smart bulk file renamer. Just rename 1 file and it will do the rest.
Blog post: https://teo-orthlieb.github.io/blog/simple-renamer/
1/ Find and open Regedit in start menu
2/ create the keys if not present: HKEY_CLASSES_ROOT/*/Shell/Batch Rename/command
3/ change default value of command to absolute/path/to/gui.exe "%1"