Yeah, it’s super weird. I once named a file with mixed case, but one of the letters was the wrong case. Renaming the file didn’t work at first. Renaming a file named PAscalCase.txt to PascalCase.txt resulted in no change to the filename. Windows continued to show it as PAscalCase.txt. I had to rename it to something totally different with different characters entirely, then rename it again to get it right.