This policy sets a list of file types that should be automatically opened on download. Note: The leading separator should not be included when listing the file type, so list "txt" instead of ".txt".
By default, these file types will be automatically opened on all URLs. You can use the 'AutoOpenAllowedForURLs' (URLs where AutoOpenFileTypes can apply) policy to restrict the URLs for which these file types will be automatically opened on.
Files with types that should be automatically opened will still be subject to the enabled Microsoft Defender SmartScreen checks and won't be opened if they fail those checks.
File types that a user has already specified to automatically be opened will continue to do so when downloaded. The user will continue to be able to specify other file types to be automatically opened.
If you don't set this policy, only file types that a user has already specified to automatically be opened will do so when downloaded.
This policy is available only on Windows instances that are joined to a Microsoft Active Directory domain, Windows 10 Pro or Enterprise instances that enrolled for device management, or macOS instances that are that are managed via MDM or joined to a domain via MCX.
|Registry Hive||HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER|