Well, I have become very good at creating nonexistent errors:-)
(I was using simple squares and circles for testing, and ran some tests on another (work) computer too.)

With correctly named files (including correct extensions), and without incorrectly named files (including no incorrect extensions),
AssignName and AssignPresetName seem to work correctly in MoI3 and MoI4beta.

Somehow in the past 5 years or so, I've acquired extra copies of the 2 .....dialog.htm files, which are incorrectly named
AssignNameDialog.js, and AssignPresetNameDialog.js. The extensions should be .htm.
Also present are the correctly named .htm files.

Also the PresetNames.txt file was not copied over to MoIBeta command folder.

I also have correct and incorrect versions for custom.ui, with _underline prefixes...

Supporting a zip of 3rd party scripts would be more work, and may have risks...
Maybe there could be a zip file of non-stock, non-third party, proven scripts?
Maybe a listing of the names of the good, valuable, third party scripts?
Then there are the "not ready for prime time scripts." :-)

- Brian