I want to use the SqlExpress2008 Bootstrapper for a new installation on Windows7, I do not want to use the default SQLEXPRESS Instance. I have attempted to edit the package.xml file located in: C:\Program Files\Microsoft SDKs\Windows\v7.0A\Bootstrapper\Packages\SqlExpress2008\en\package.xml and updated the command argument instancename=CUSTOMINSTANCE But unfortunately it still creates the default SQLEXPRESS not CUSTOMINSTANCE The wix tag is as follows: <sql:SqlDatabase Id="SqlDatabaseCore" ConfirmOverwrite="yes" ContinueOnError="no" CreateOnInstall="yes" CreateOnReinstall="no" CreateOnUninstall="no" Database="MyDatabase" DropOnInstall="no" DropOnReinstall="no" DropOnUninstall="no" Instance="[SQLINSTANCE]" Server="[SQLSERVER]"> <sql:SqlFileSpec Id="SqlFileSpecCore" Filename="[CommonAppDataFolder]MyCompany\Database\MyDatabase.mdf" Name="MyDatabase" /> <sql:SqlLogFileSpec Id="SqlLogFileSpecCore" Filename="[CommonAppDataFolder]MyCompany\Database\MyDatabase.ldf" Name="MyDatabaseLog" /> Is this the standard way to accomplish this?