/usr/lib/libACE_HTBP.so is in libace-htbp-dev 6.3.3+dfsg-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libACE_HTBP-6.3.3.so
/usr/lib/libACE_HTBP-6.3.3.so