override a sql server database

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SQL

server

I have created table in sqlserver and this table is attached to my windows form application, tel is in use at client premises.

eg:

name : table1( col1, col2,col3)


now i want to add few more columns in table 1 without losing the table values in client place,
problem is i don't have sql server in that place and also i need to give them oly has .bak file