/usr/share/xmms2/scripts/startup.d/xmms2-mlib-updater.sh is in xmms2-client-medialib-updater 0.8+dfsg-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 | #!/bin/sh
exec /usr/bin/xmms2-mlib-updater
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