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Sometimes a 'file association' error occurs in Windows. What this means is that Adobe Digital Editions (ADE) is not set to open ACSM files. This is an easy error to fix with the steps found below.
If you've tried download an eBook and aren't sure what the 'booktitle.acsm' file you got instead is, don't worry. The ACSM file is used to download an eBook. If it doesn't work when you try to open it, please follow the steps below.
Click Start, and type 'Default Programs' into the search box. Press Enter.
Click Associate a file type or protocol with a program.
Scroll down, and select the ACSM file type.
The extension should be set to 'Adobe Digital Editions' (under 'Current Default'). If this is not the case, click Change program… and select Adobe Digital Editions.
You may have to click the Browse button if 'Adobe Digital Editions' is not listed. Find the digitaleditions.exe (application)and select it from the following location:
64-bit Systems: C:\Program Files (x86)\Adobe\Adobe Digital Editions
32-bit Systems: C:\Program Files\Adobe\Adobe Digital Editions Note: You can find which system type you have by going to Start > Control Panel > System. Look under 'System Type'.
Click the OK button to save the changes.
Open My Computer. Go to: Tools > Folder Options.
Click the File Types tab.
The extension should be set to 'Adobe Digital Editions'. If this is not the case, click Change and select Adobe Digital Editions.
Click the OK button in each window to save the changes.