How can I convert a *.rtf file to *.doc file programmatically?

[Redmond@139.]

hello sir/madam
      I'm using Windows 7 and Visual Studio 2008 team version & 2013 commnunity version,and I have installed libreoffice 5.0 sdk,I'm not too familar with C++ ,but my project was using VC++,so how do I convert a *.rtf file to *.doc programmatically?any help would be appciated.
Regards
Ken


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