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I'm looking for an open source, command-line tool to convert files from the old, binary Excel ".xls" format to the new (Excel 2007) Open XML .xlsx, without Excel installed, on a Windows PC.

Ideas?

Edit: Open source is strongly preferred, but free for commercial usage is ok too.

Edit: Additional software, such as Excel Viewer, can be installed on the system, as long as open/free for commercial usage.

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Does it actually need to be open source? Or just free? –  jftuga May 3 '12 at 13:04
    
Hi, as I know it should be possible to run LibreOffice in CMD mode - even on a server. However I do not have further experience with it. –  Juhele May 3 '12 at 20:39
    
This reference says that LibreOffice cannot be used to save in Open XML format; it can only read. Might have to look for other options? –  prrao May 4 '12 at 3:01
    
Would it be possible to have Excel Viewer installed? –  Keen Aug 27 '12 at 21:26
    
Editing your post is fair for the others to know about it but you can mention the user who asked you about the Open Source/Free. By the way you still don't mention is any freeware preferable from you or not? –  avirk Sep 20 '12 at 12:49
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