the problem of putting the mta file into the right folder?
using that what one found as solution for one's own action?
Creating some actions to replace the brackets?
I think I go with 3.
Create an a action group with a name of your choice
In that action group creat an action of the type "Replace" for the field that you don't mention
Search string: [
Replace string: (
In the same action group create another action of the type "Replace" for the field that you don't mention:
Search string: ]
Replace string: )
Save the action group,
Select all the files that should be treated.
Execute the action.
Done
As I wrote: you can join several actions in one action group which is then executed with just one mouse click. No need to run the 2 actions separately.