Prompt before saving
Supported on: At least Windows Server 2008 R2 or Windows 7
Registry
HKCU
software\policies\microsoft\office\16.0\ms project\options\save Value name: automaticsaveprompt
Enabled: automaticsaveprompt = 1
Disabled: automaticsaveprompt = 0
Description
Specifies whether Project should prompt the user before saving their project as a result of the Auto Save function. If you enable this setting, users will be prompted before their project is automatically saved. If you disable or do not configure this setting, the user's default setting is used.