As koland says, the best way if you are purchasing ebooks from places other than Sony store is to use the Sony software only for Sony purchases and freebies and allow ADE to download ebooks from all other places.
To restore the acsm file association back to ADE if the Sony software currently has it is to reinstate it to ADE using Windows Explorer or if you are using Firefox it should ask you what program you want to use when you click on the download link in the ebook store or just reinstall ADE and that should fix it.
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