Microsoft Office 2007 Compatibility
If you have tried to open an Office Document / Spreadsheet / PowerPoint and received a compatibility error which kept you from opening the document, it was probably created in Office 2007 without being saved in Compatibility Mode. Microsoft Office 2007 is not automatically set to be backward compatible with older versions of Microsoft Office. Here are 2 ways to solve this issue:
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Have the person who sent you the file save the file in Compatibility Mode in Office 2007 and then resend it to you. Saving in Compatibility Mode is done in Office 2007 by clicking the Office button in the upper left corner, clicking on Save As, and then clicking Word / Excel / PowerPoint 97 – 2003 Document.
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The file is a very small executable, accept the license terms, then install and you will immediately be able to open Office 2007 documents.