I'm not sure if I'm doing something wrong here.

I'm having an issue where

mysite.com/template/page.html changes to mysite.com/template/page/

(where 'template.php' is the file and 'page' is the post)

Is there something I need to do to ensure that it keeps the .html part?

(If it makes a difference, I'm using a clonable template with nested pages enabled so I can have next/previous links)

[trendoman]

You are not doing it wrong.

A nested-page allows another nested-page (cloned out of the same template) to be placed below it as its child page.

notice that unlike regular cloned pages, there is no '.html' extension

You are not doing it wrong.

A nested-page allows another nested-page (cloned out of the same template) to be placed below it as its child page.

notice that unlike regular cloned pages, there is no '.html' extension

Darn, is there any way to get next/previous page links (in page view) automatically without using nested pages?
I'm not actually nesting pages, that's the only reason I'm using nested at all.

[KK]

is there any way to get next/previous page links (in page view) automatically without using nested pages?

One way would be this -
viewtopic.php?f=2&t=21

is there any way to get next/previous page links (in page view) automatically without using nested pages?

One way would be this -
viewtopic.php?f=2&t=21

That looks like it would work perfectly. Gracias.