See
You might look at the Notepad example under tutorials for a start to see what AutoIT does.
You will likely need to use
to understand how to do the editing and running to begin with.
The direct link to the Notepad example is:
but there are other tutorials on the above page.
The script editor is introduced here:
This all may seem harder than having a pre-worked solution, but you currently don't have a pre-worked solution (and I am very disappointed in 3dcatia for not keeping that macro) so this is the best path I can suggest.
One very nice feature is that most every part of AutoIT has good documentation that includes a description, all the parameters, and a working example. For example:
You don't have to understand much initially - you can copy the example to a new script and save and run the example to see what it does and then you can go back line-by-line to see what each line is for.
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What is interesting to me - I worked a project where an Italian company sold us their drawings to use with a US government contract. All the drawings had to be converted to English. They also had to be converted to English units from metric and converted from 1st angle projection to 3rd angle projection. In all, a search and replace would have been such a tiny amount it wasn't worthwhile. Hopefully changing text is all you need to do.