when closing Max, need a script to check all texture map path and give warning.

I want to have a script like this,

Our studio has the rule like all texture maps must be saved at H (network Drive).

But a few 3d artists always forget to do this.

So, when closing MAX, there is a script to check all the texture map paths. If any texture maps are not in H drive, a warning will popped out before closing.

Can anyone give some direction to wrtie this?