Choose a specific app to open a particular file I created some e-learning using Articulate Storyline 2 which I want to view on my Samsung Galaxy. The files are physically in my Documents folder. The module is not on the internet - I'm still testing it. The file to run the e-learning module is "story.html." It will - I'm told - run on Android with the use of a free app called Articulate Player - which I have installed. When I attempt to run the "story.html" file I get three options - "HTML Viewer," "File Editor" and "DB Text Editor," none of which work. Articulate Player app is not provided as an option. So how can I choose Articulate Player app to run the "html.story" file?

I've looked in applications manager but there are no options I can see that help.

I must add, please pardon my ignorance as I know next to nothing about mobile phones. I have avoided them like the plague for years and only got this one recently as a matter of necessity. I would be grateful for any help from anyone and thanks for your time.
You can only open files with apps that tell Android they support that kind of file. If the app tells Android it can open that kind of file, it'll show up in the list of possible apps.

If this app you mention can open this kind of file, the developer needs to change the app to tell Android it can do so, by adding an intent filter in its manifest. You should contact the developer and ask them to do so.