Writer will dot open files except read only. I have to save them with another name again again again unless I save on the desktop. In properties the files are not flagged read only. Attributes have only one A and dashes. Have reset Libre Office profile, no use. Have also created a new local profile for windows 10. Libreoffice Version: 184.108.40.206 (x64) This is a new problem. nothing has changed that I know of, I have been using Libreoffice for years.
Could you check if answer to this question (i.e., the Fall Creators update and its new “Windows Defender Controlled Access” feature) relates to you?
It seems to remain here with version 220.127.116.11 on May 2020 :~(