```ruby
# AttachmentFu sets the Attachment content type from the browser sent Content-type header
#
# This monkey patch uses UNIX file utility to fix broken or missing content types headers

module Technoweenie::AttachmentFu::InstanceMethods
  def uploaded_data_with_unix_file_mime_type=(file_data)
    tmp_file = self.uploaded_data_without_unix_file_mime_type=(file_data)

    if tmp_file.present? && (unix_file = `which file`.chomp).present? && File.exists?(unix_file)
      `#{ unix_file } -v` =~ /^file-(.*)$/
      version = $1.to_i

      self.content_type = case version
                          when 5
                            `#{ unix_file } -b --mime-type #{ tmp_file.path }`.chomp
                          else
                            `#{ unix_file } -bi #{ tmp_file.path }`.chomp =~ /(\w*\/[\w+-\.]*)/
                            $1
                          end
    end

    tmp_file
  end

  alias_method_chain :uploaded_data=, :unix_file_mime_type
end


```

Make unix_file_mime_type compatible with file versions < 5
user
```ruby
# AttachmentFu sets the Attachment content type from the browser sent Content-type header
#
# This monkey patch uses UNIX file utility to fix broken or missing content types headers

module Technoweenie::AttachmentFu::InstanceMethods
  def uploaded_data_with_unix_file_mime_type=(file_data)
    tmp_file = self.uploaded_data_without_unix_file_mime_type=(file_data)

    if tmp_file.present? && (unix_file = `which file`.chomp).present? && File.exists?(unix_file)
      `#{ unix_file } -v 2>&1` =~ /^file-(.*)$/
      version = $1

      self.content_type = if version >= "4.26"
                            `#{ unix_file } -b --mime-type #{ tmp_file.path }`.chomp
                          else
                            `#{ unix_file } -bi #{ tmp_file.path }`.chomp =~ /(\w*\/[\w+-\.]*)/
                            $1
                          end
    end

    tmp_file
  end

  alias_method_chain :uploaded_data=, :unix_file_mime_type
end


```
assistant