from FrontPage to Dreamweawer?

In view of the number of files your site contains, it's quite understandable that the first step should be to port it to a tool that's up to the task.

So, as @Ben M suggests, I wouldn't invest such a volume of work on software that's only in stability maintenance.

There's the VSC solution (https://code.visualstudio.com/docs/introvideos/basics), which is really a very powerful, comprehensive tool, packed with unimaginable features and automation, and which, to top it all off, is free... it's worth a try.

As @Nancy OShea points out, the age of your site raises questions about its architecture and layout model... you're alluding to the use of template models, and asking which Dw template to use.

Quale modello di Dreamweaver?

By @Vincenzo35200801d1kb

Is that it ? Could you please tell us more about this?

I ask this question because it's understandable that, on the one hand, starting from scratch with a new approach is understandable, but on the other hand, in your case, it's unimaginably time-consuming, and a colossal job ... so... it may also be time to use routines (in shell, ruby, python, or whatever...) to rectify the structure of your content and, above all, adapt it to a more contemporary model... and in this sense VSC also offers a whole range of integrated tools (or integrable through infinite extensions)... the Terminal and real-time adaptation of the control and commands plate (Ctrl Shift P), remain major components of this talented tool.

113,000 files???  2051 folders???

Yikes!

That's not a website.  That's a 10,000 kilo gorilla. 

FrontPage ended in 2006.  The web has changed a lot in 18 years and so have the devices that people use to access the Internet.  So it's fair to say that your current site is sorely outdated if not totally obsolete by today's standards. 

Please give some thought to rebuilding your site with a scalable CMS (content management system) and database.  It's foolish to think you can maintain a site that large with a static HTML solution.  You need a dynamic system to help you organize & manage large amounts of content efficiently.

Dreamweaver is a code editor for experienced developers with a working knowledge of HTML5, CSS, JavaScript and at least one server-side programming language.  In the absence of coding skills, you should look at online site builders like Webflow, Wix or WordPress.  Or possibly a pro-level solution like Adobe Experience Manager (CMS & DAM) or Adobe Commerce  (formerly called Magento).  Whichever you decide will depend on your skills, budget and future requirements.

The alternative is to hire an experienced web developer who can build you a custom system that allows you to maintain your site without coding skills.

Hope that helps, good luck.

No, it wouldn't make sense. Dreamweaver is in minimal maintenance mode and is likely heading for the same fate as Frontpage. Honestly I would re-evaluate your site and figure out whether you need that many pages, and what your aspirations are whether you want to continue to code it or would prefer to only be editing on the front-end. At that point, there are plenty of viable options to explore to manage your site from self-hosted CMS, to a 3rd-party hosted CMS, or even to more modern code development tools depending on your preferences.