/usr/share/boinc-server/tools/appmgr is in boinc-server-maker 7.0.24+dfsg-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/boinc-server/tools/../../../lib/boinc-server/tools/appmgr
/usr/share/boinc-server/tools/../../../lib/boinc-server/tools/appmgr