Hello @Joginder Nahil ,
Welcome to Microsoft Q&A forum.
Normally, you can use VSIXSignTool to sign a VSIX(VSIXSignTool.exe sign /f <certfile> /p <password> <VSIXfile>
) with a password protected certificate file.
If Comodo Code Signing you mentioned is a code signing certificate, you can refer to this document: To use the VSIXSignTool.
If Comodo Code Signing you mentioned is a code signing tool, I suggest posting this issue on Comodo Code Signing related forums or referencing the related guide documents for further help.
Have a great day.
Sincerely,
Tianyu
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