Rails - May 2009 - Paperclip: strange mime type on windows

When i upload a pdf, validations doesn''t work, only images validation
works. Avoiding check, file was loaded but with this content type:
file_content_type: "binary/octet-stream"

How can i solve? I''d like to have "application/pdf"
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I partially solved using this plugin to get correct mime from extension:
http://code.google.com/p/mimetype-fu/

And in my model i added:

  validate :validate_content_type

  protected

  def validate_content_type
    errors.add(:file, "Format #{File.mime_type?(file.path)} is 
invalid!") unless File.mime_type?(file.path) == "application/pdf"
  end


If somebody want to get better this code will be appreciated
Thanks in any case
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