Code Signing - How to sign .EXE, .DLL and .CAB files

Purchase a code Signing certificate from http://www.ascertia.com/OnlineCA/default.aspx (There is a 30 days demo also) and download the private key with certificate (pfx file)
Open command prompt
Go to directory

%programfiles%\Microsoft.NET\SDK\v2.0 64bit\Bin\

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%programfiles%\Microsoft.NET\SDK\v2.0 64bit\Bin\
Ready to sign your file by typing:

signtool sign /f <span>C:\file.pfx</span> /p password C:\filename.exe

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signtool sign /f <span>C:\file.pfx</span> /p password C:\filename.exe
Verify the file:

signtool verify /pa /v C:\filename.exe

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signtool verify /pa /v C:\filename.exe

More information: https://www.ascertia.com/helpdesk2/index.php?/Knowledgebase/Article/View/13