Mysterious link in an Internet page.
 

Hi: please go to http://www.archive.org/stream/Joseph...e/n41/mode/2up. If I just click it, then some kind of reader opens and lets me read the corresponding file. If I right-click and choose Save Target, then the file command tells me it is an HTML file. However when I read it with a web browser, it only shows a few lines. What is the file format, can you tell me.

Post reported, dupe of: https://www.linuxquestions.org/quest...ge-4175613231/

The duplicate OP in the slackware was deleted and therefore closed.

opens in an external epub/pdf reader for me.
i suspect you have restricted javascript execution; you have to expect that sort of behavior when you do that.
or are you still using that horribly outdated firefox? you should put that in your signature so people know what they're dealing with.

Might be able to view source of page to see what it is??

It is an ePub document that needs an epub reader - for which there IS a addin for Firefox and other browsers.

It appears there isn't a file format,as such, provided by that link but, as mentioned above, a Javascript reader with a file opened. When I open it in Chromium (I can't be bothered working out what to enable with NoScript in Firefox) I get an option to download a file in a few formats including ePub and PDF.
If you want a link to a file I can provide one in the format you like, this is a link to the pdf, for example.