Customize sql startup query window from:

C:\Users\My-PC\AppData\Local\VirtualStore\Program Files (x86)\Microsoft SQL Server\90\Tools\Binn\VSShell\Common7\IDE\SsmseeTemplates\Sql\SqlFile.sql

(Chclt)

C:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\VSShell\Common7\IDE\SqlWorkbenchProjectItems\Sql\SqlFile.sql