title: Is there any Open source Library to generate and edit .xls and .ppt file?
body: <p>My task is to extract information from ppt file and compare with another ppt file. I have to use windows platform so i used excel and powerpoint's COM object.</p>
  
  <p>After developing and testing the code in my computer when i exported the file into another computer it just failed. I started to debug in that file, and surprisingly debug was successful from first to last but as soon as click on the executable it fails.</p>
  
  <p>I am totally *ucked up now cause inspite of updating excel dll files into those computers  (which will serve the com support) it's not working. In every pc it gives different error message. I don't wanna work COM object anymore. It *ucks.</p>
  
  <p><strong>Can anyone suggest me any open source alternative in which i can read and extract information from Excel and Powerpoint files (both 2003 and 2007 format) ???</strong> </p>
  
  <p>My preferred language is c# ........I got an paid solution (aspose) but i don't wanna go for that.</p>
  
  <p>Any help will be appreciated. Just suggest me how can i deal with office files assuming ms office is not installed in my computer. </p>