How to delete Label file but that label file was didn't show AOT but available in server

How to delete Label file but that label file was didn’t show AOT but available in server in AX2012

What does that mean?

My guess it that you still have the physical label file (.ald) on an AOS.

This may help,
community.dynamics.com/…/how-to-delete-label-files-from-ax-2012