For Windows platforms, below are the only supported methods we can use to digitally sign Authenticode executables:1) We can use the old SignCode.exe tool (shipped with Authenticode tool for IE or SDK or VS.NET) for signing. SignCode.exe is an old tool from Microsoft to sign Authenticode executables (EXE, DLL, MSI). Newer version of the tool is named SignTool.exe. SignTool.exe is shipped with Microsoft Platform SDK. It is preferred to use the newer SignTool.exe tool. Please note that the command line options for SignTool.exe are different from SignCode.exe. 2) We can programmatically use CryptUIWizDigitalSign API for signing Authenticode executables (MSI, EXE, DLL) (Note this API is only available on Windows XP or above). Additionally, CAPICOM.SignedCode essentially does the same thing. Read more: How to sign EXE files with an Authenticode certificate Part 1, Part 2