File.new variable with extension

I ned to create a file of the name of a variable?
but i can't create an extension.

File.new((@page.title), 'w' ) {|file| file.write( 'testfile' )}

how can i maka a extension like this

File.new((@page.title.txt), 'w' ) {|file| file.write( 'testfile' )}
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