Why does Path.rglob() returns filenames in lower case if whole name is specified as pattern?

I'h have an executable named "MyCamelCase.exe" in the current python script directory and in a subfolder "MyFolder". Additionally, in "MyFolder" there is another executable "DontWannaFindThis.exe". I'd like to find all occurences of "MyCamelCase.exe" in the current directory and all subfolders. Therefore, I'm using Path.rglob(pattern):

from pathlib import Path

if __name__ == '__main__':

    [print(f) for f in Path.cwd().rglob('MyCamelCase.exe')]
    [print(f) for f in Path.cwd().rglob('.\MyCamelCase.exe')]
    [print(f) for f in Path.cwd().rglob('*.exe')]

This code leads to the following output:

D:\PyTesting\mycamelcase.exe 
D:\PyTesting\MyFolder\mycamelcase.exe
D:\PyTesting\mycamelcase.exe
D:\PyTesting\MyFolder\mycamelcase.exe
D:\PyTesting\MyCamelCase.exe
D:\PyTesting\MyFolder\DontWannaFindThis.exe
D:\PyTesting\MyFolder\MyCamelCase.exe

Why does rglob returns a string with only lower case if a provide the full file name and on the other hand return a string containing the original notation when using a pattern with '.*'? Note: The same happens when using Path.glob()