Greek letters with .readline() and tkinter

[KinkgOfKeks]

I am currenty working on a projekt with tkinter(Python 3.11.2), for wich I have to use the greek alphabet. The Problem is, that if I try to write greek letters with an accent(for example ώ, ὠ or ὡ) into an input box witch I have created with

tk.entry()

, it shows a questionmark instead of the letter.
Also if I try to read data from a seperate .txt file with

.read

, I get a combination of some special characters.
As an example:
ω becomes ω
α becomes α

Is there a way to solve these Problems?