I am trying to make Adobe Digital Editions the default app to open .acsm files, to allow reading of downloaded ebooks from the university collection. When I got to Settings>Apps>Default Apps>Choose Default apps by File Type and go down to .acsm, it says "there is no installed app for this type of file or protocol."
I definitely have Adobe Digital Editions installed- it is in the computer's program files with all of the other Adobe products. I have uninstalled it and reinstalled ADE 4+ times.
What can I do to get the computer to recognize this app? I have installed it, and used Adobe Digital Editions on other computers in the library. My own desk computer, however, is a no go.