That code does not stop the user changing the names, it gets the names set in the Advanced naming section. One should use engine.getPageExtension() instead of writing '.html'

Sorry I still don’t understand this!

I assume that if if I put in init.bsh the code

String ext= engine.getPageExtension();

I see which extension has been selected by the user.
But can I overrule that setting with a statement like

engine.setPageExtension(“.html”);

? And what should I code in hints.jap to select .html as default extension?

And in init.bsh, when I'm creating the page from the skin's template for the info page:

File iptemplate = new File(skinDirectory + "/infopage.htt");
File ipoutput = new File(rootOutputDirectory + "/infopage" + engine.getPageExtension());
engine.processTemplateFile(iptemplate, ipoutput);

I did check my backup files, the selected file extension was always .htm
IfI use that extension it can't be displayed on my iPad

This looks like an iOS bug!

Make sure that all your albums are using just .htm or just .html! it might just be that mixing them is the problem. I believe it is not recommended anyway.

It looks like our server is sending the wrong content-length when using index.htm as index file, and the page is using gzip compression (which all compressable files are on our server). And the Safari browser chokes on that (both on MacOS and iOS).
I'll look into this today.

However, due to server optimization it's much faster to use the normal index.html index file name, so please don't use the .htm extension. (But the skin should, as others have said, always use the extension set by the user.)

(When fetching a "folder" URL ending with a / the server immediately tries to fetch the index.html. If that fails it starts a process of checking if the folder exists at all and if it does it tries to fetch the various index-files. There are 580 times more index.html files on our servers than index.htm files so it more likely the folder doesn't exist than that there is an index.htm file there.)

I trust you're looking for all of these: https://www.ipage.com/help/article/scripting-how-to-set-default-page-priority

On an iPad and iPhone only index.html, no index.htm