This policy setting specifies whether PowerPoint prompts users to change their file extension associations for any file types that are no longer associated with PowerPoint.
If you enable this policy setting, when users start PowerPoint, they are not prompted to change file extensions for any files that are no longer associated with PowerPoint. In addition, the checkbox on the user interface (UI) under File |Options | General | Start up options | Tell me is unchecked.
If you disable or do not configure this policy setting, when users start PowerPoint, they are prompted to change file extensions for any files that are no longer associated with PowerPoint. Users can change this behavior either by selecting the checkbox displayed in the prompt, or by selecting the UI checkbox under File |Options | General | Start up options | Tell me (which is selected by default).
| Registry Hive | HKEY_CURRENT_USER |
| Registry Path | software\policies\microsoft\office\16.0\powerpoint\options |
| Value Name | alertifnotdefault |
| Value Type | REG_DWORD |
| Enabled Value | 1 |
| Disabled Value | 0 |