The name of an Outlook signature or the path and file name (without file name extension!) of a signature file. Depending on body text type, the file name extension txt, rtf or htm will be appended.
Platforms: Windows 10 (Version 21H2 - 23H2), Windows 11 (21H2 - 22H2), Windows Server 2016 - 2022
.NET: .NET Framework 4.8, .NET 6, .NET 7, .NET 8