I recently was unable to get ebooks from the library and was able to diagnose that Adobe Digital Editions was not associated to .acsm (the format that our library uses for ebooks). When I go to control panel and try changing it in 'Default Programs', it just doesn't work. I browse to DigitalEditions and then say open and the browse window closes, but it does not add DigitalEditions as an option. Any help is appreciated.
Right Click on the File.
Choose the Point open with
If digital edition under "Choose default program ..."
Under more option choose the path of Digital Edition and choose the Digital Edition.exe.
Then click ok and try if works.