/usr/bin/x86_64-w64-mingw32-gcc-win32 is in gcc-mingw-w64-x86-64 7.3.0-11ubuntu1+20.2build1.
This file is owned by root:root, with mode 0o755.
It is a symlink to /usr/bin/./usr/bin/x86_64-w64-mingw32-gcc-7.3-win32
/usr/bin/./usr/bin/x86_64-w64-mingw32-gcc-7.3-win32