How I will unblock my cross-origin request is blocked due to CORS request not http

Access to XMLHttpRequest at 'file:///C:/Users/Dubai%20Computers/Music/web%20designing%20and%20development/ajax/lecture%201/data.text' from origin 'null' has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, chrome-untrusted, https.
data.text:1 Failed to load resource: net::ERR_FAILED

let textbutton = document.querySelector('#text-btn');

textbutton.addEventListener('click', function () {

    //create ajax request
    let xhr = new XMLHttpRequest();
    //prefare request
    xhr.open('GET', './data.text', true);
    //send request
    add(xhr);
    function add(request) {
        request.setRequestHeader("Access-Control-Allow-Origin", "*"); request.setRequestHeader("Access-Control-Allow-Headers", "Content-Type");
    }
    xhr.send();
    //process request
    xhr.onload = () => {
        if (xhr.status == 200) {
            let data = xhr.responseText;
            console.log(data);
        }
    };

});