My RHistory file opens in a other language

I always saved my code into the rhistory file. But today, it opens me a script with unreadable characters like :

%��xE�F�״@#.�L�6e�o`�.r�)�FI� =�� y���|A'f9ޘ3����<��|��9�y��~MJY�je�}<����� ��czm���g0�P\㷿�p����c(X�ϐ8�����@F��W��88<=�48��>�����

Do you have a solution ?
Thanks