executing one .sql file from another

I need to run a x.sql fil from another y.sql file. The y.sql file is executed by OSQL.
I can't find out if it is posible or not. I triet using EXEC but that doesn't work.if you create each as stored procedures, you can exec them from eachother...otherwise (though it is a terrible habit and not recommended) you can use xp_CMDShell