After insalling Windows 10, the error message "E_ADEPT_DOCUMENT_OPEN_ERROR" may occur in Adobe Digital Editions.
The error occurs if the read or write permissions for the directory "../My Digital Editions" were not set correctly when upgrading to Windows 10.
When you log in with a newly created Microsoft account instead of a local user account, access is no longer available.
- Restore the permissions manually for the logged in user to the directory "../My Digital Editions".
- Uninstall Adobe Digital Editions and then reinstall it. Use the account you are going to use in the future.