YOU SAID:

windows can't open by themselves

INTO JAPANESE

窓はそれ自体で開くことができません

BACK INTO ENGLISH

Windows cannot open on their own

INTO JAPANESE

Windowsは自分で開くことができません

BACK INTO ENGLISH

Windows cannot open itself

INTO JAPANESE

Windowsは自分自身を開くことができません

BACK INTO ENGLISH

Windows cannot open itself