Problem with page submitting

Hello, I was usually preparing my Article in Word File than made copy/past into the WP, then switched to HTML, removed some code at the beginning and switched back and published.Now I tried to submit new page and found something new in the submitting interface.My old pages are shown like some code and I can’t submit new page as a Word File like it was before. Are there any changes in WP or I have to fix something in my admin panel?
Thank you!