If we want to run rails app with paperclip in windows environment, we need to install two package for it.
GnuWin32 - http://gnuwin32.sourceforge.net/packages/file.htm
ImageMagick binary- http://www.imagemagick.org/download/binaries/
Next, we should install the correct static version for your OS (32-bit vs 64-bit) (not dll version)
Finnally, we need to add the bin directory to your environment path (in config/environment/development.rb or production.rb) as following lines:
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