Is there a script to generate the Invoice HTMLText?

The HTMLText is the html source code recorded when the invoice profile page is rendered by the browser, it's not generated by a script. The code to record and save the html source is in the invoice profile asp pages and invoice batch print asp pages.
Viewing the invoice profile page or running the batch print invoice should trigger the browser to render the html source code and save them into the invoice table, HTMLText field.
Note it will read the current data, since the original data is not saved.