Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_45 ( platform_s_ VARCHAR, year VARCHAR, director VARCHAR )

### Question ###
What platform was used for the game directed by Bryan Walker after 2006?

### Accurate SQL ###

SELECT platform_s_ FROM table_name_45 WHERE year > 2006 AND director = "bryan walker"