Rails - Feb 2006 - Re: file_column on windows?

I am not able to get this to work on Windows, and the problem has been
documented with a fix here, but I can''t get the fix to work, either. 
Ok, I
admit it: I am a newbie with rails!

here is the problem''s fix:

You can fix your file_column for now by replacing the get_content_type
method in lib/file_column.rb with this version:

    def get_content_type(fallback=nil)
      content_type
    end

But when I try this, I get:

undefined local variable or method `content_type'' for
#<FileColumn::TempUploadedFile:0x370f9a8>

Obviously, I am doing something wrong... any help would be appreciated.