How to Set Acrobat X as Default PDF Handler with Acrobat DC Installed
Question details
The user needs to configure Adobe Acrobat X as the primary PDF handler on a computer where Adobe Acrobat DC is also installed.

- Product
- Adobe Acrobat
- Device & OS
- Windows
- Scenario
- Managing file associations when multiple versions of a PDF application are installed on the same system.
- Observed behavior
- Windows file-association settings and Acrobat's internal default-program controls may conflict, causing Acrobat DC to repeatedly override Acrobat X as the default handler.
Ensure you are logged into your Windows computer with an administrator account, as modifying default application settings and file associations requires administrative privileges.
Change Default PDF Application via Windows Settings
The most reliable method to force Windows to use Acrobat X instead of Acrobat DC is by manually assigning the file extension in the Windows Default Apps menu.
Windows 10 and Windows 11 manage default programs centrally. Assigning the default program by file type prevents other versions from passively hijacking the association.
Press the Windows key + I on your keyboard to open the Windows Settings menu.
Click on 'Apps' from the main menu, and then select 'Default apps' from the left-hand navigation pane.
Scroll down to the bottom of the Default apps page and click on the 'Choose default apps by file type' link.
Scroll down the alphabetical list until you find the '.pdf' file extension.
Click on the current default app (which is likely showing Acrobat DC or Microsoft Edge) and select Adobe Acrobat X from the pop-up list of available applications.

Use the 'Open With' Context Menu
You can quickly override the current default handler by right-clicking any PDF file directly from the Windows File Explorer.
Adjust the Default PDF Handler in Acrobat X Preferences
You can instruct Acrobat X to claim the default PDF handler status from within its own application preferences.
Experience Hassle-Free PDF Management with WPS Office
Dealing with file association conflicts between multiple versions of Adobe Acrobat can be frustrating and time-consuming. Consider switching to WPS Office, a lightweight, free, and highly compatible alternative that includes a robust built-in PDF reader and editor. Avoid installation conflicts while enjoying a unified, seamless document workflow.

Frequently Asked Questions
Why does Acrobat DC keep overriding Acrobat X as the default PDF app?
Acrobat DC often includes background update services that regularly check and re-assert itself as the default PDF handler. This can cause Windows to revert your preferred settings for Acrobat X back to DC after an application update or a system reboot.
Is it safe to have Acrobat X and Acrobat DC installed at the same time?
While you can technically install both versions on the same Windows machine, it is generally advised against. They share specific registry keys and system resources, which frequently leads to application crashes, plugin errors, and persistent file association conflicts.
How do I fix missing PDF thumbnails after changing the default app?
If PDF thumbnail icons disappear in Windows Explorer after switching your default handler to Acrobat X, open Acrobat X, navigate to Edit > Preferences > General, and ensure the 'Enable PDF thumbnail previews in Windows Explorer' option is checked. You may need to restart your computer for the change to take effect.
Can I set WPS Office as my default PDF reader instead?
Yes. If you install WPS Office, you can set it as your default PDF application through the Windows Default Apps settings or by checking the 'Set as default PDF reader' option during the installation process. It provides a stable reading experience without the conflicts typical of multiple Adobe installations.




