When I download an ebook on my computer, it doesn't open with the right program. How do I change the default program for ebooks?

Windows 7 and 8

1. Go to Start > Control Panel > Default Programs > Associate a file type or protocol with a program.
2. Under Extensions, select .acsm puis and click the button Change program. The window Open with should appear.
3. Click on the Browse button and find the desired program. For example, Adobe Digital Editions should be in C:\Program Files\Adobe\Adobe Digital Editions\digitaleditions.exe.
4. Click on Open to associate the .acsm file type with the selected program.

Windows 10

1. Right-click the Start button.
2. Click on Settings.
3. Click on Apps.
4. Select Default apps on the left.
5. Scroll down a little and select Choose default apps by file type.
6. Next to the .acsm file extension, select Adobe Digital Editions.

Windows 11

1. Open the Settings app (Windows key + i).
2. Click on Apps in the left pane.
3. Click on Default apps in the right pane.
4. In the Set defaults for applications section, enter the name of the application you want to set as default and then click on the application name.
5. To set the selected application as the default application for a file type, click on Choose a default or on the name of the application currently defined.
6. Click on the desired application. If your application is not displayed, click on More apps.
7. Click on OK.

You can also directly enter the fille extension whose default application you want to change in the text field under Set defaults for a file types or link types.

Mac

1. Right-click on the file .acsm that you downloaded and select Get info.
2. In the Open with: drop-down menu, choose the desired application.
3. Click on the Change all button to associate all files with the selected application.
4. Click on Continue.

Now double-clicking on the .acsm file that you downloaded should open in the desired program.