Filename contains » character

Hello,
I am new to opencv and completely new to this forum.

I am using opencv2 with python3 under Windows.

I have many directories containing image files which I want to open and display with opencv.
Many file/directory-names contain the character “»”.
I open these files with imread().
imread() returns None.

It definitely depends upon the file/directory name.
Using my scripts with other directories/files with “normal” names works.
As I have many files/directories containing this character and because they are referenced in html-files, renaming them is not an easy option.
I tried quoting the character with a backslash, but this does not help.
I can open and read the files with the normal open() function, so it does not look like a python-problem.

Any help is greatly appreciated.