Older version of file_coulmn plugin is not working in rails 2.2.
If you want to get working in rails 2.2 then you need to modify file_coulmn.rb file.
Update the line #619 in vendor/plugins/file_column/lib/file_column.rb from
Inflector.underscore(self.name).to_s,
to
ActiveSupport::Inflector.underscore(self.name).to_s,
Or you can download the latest plugin from the github.com: http://github.com/rust/file_column/
If you are looking to implement the old File column plugin you may visit
http://blog.dhavalparikh.co.in/2008/02/file-column-plugin/

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