Location of logon script in Active Directory

I'm trying to modify a logon script that was created by a previous employee. When I look in Active Directory Users & Computers - in the profile tab - it says Logon Script: Logon.bat

But where is that logon.bat? how can i find the path to this file?

Also, is there any way i can bulk change every users logon script location?

Have a look in \\myDomain.loc\NETLOGON\

If this is where your predecessor stored the script, you can find the location of this folder locally to the DC by opening the Computer Management console on the DC, and checking through the Shares (you'll find the path to the Netlogon share here).

As for bulk changes, in AD Users and Computers you can shift select multiple users, right click, and choose Properties. Go to the Profile tab, and change the Logon Script.