Rails - Mar 2014 - Not able to find the ruby file in command prompt with ruby and rails

Why am i not able to run win_fetch_cacerts.rb ruby file thats there in my 
desktop? :\

C:\Users\punitha\aggregator>ruby
"%USERPROFILE%\Desktop\win_fetch_cacerts.rb"
ruby: No such file or directory --
C:/Users/punitha/Desktop/win_fetch_cacerts.rb(LoadError)

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