I have had no problems importing my premium app file into 2 Samsung devices, an S6 smartphone and a Tab A 10.1 tablet. Just clocked on the name of the email attachment and it came right in. These were not files from the remote.
I just bought a Samsung 7" Tab A tablet as a more convenient size for the layout ($109.99 at BJ's, on sale). When I click on the attachment name, I get a message saying that there is no application to open this. Android does not have a list of possible destinations to select from; if there's a way to trigger such a question, please let me know. Does anyone out there who is familiar with Android know of a way to force Android to use the wifi app?
As an aside, if you open that file in Microsoft Word, you can see all the settings, including the Advanced Features System Settings password.