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If you have a problem opening Word documents from the Windows Explorer, the problem probably lies in how the document files are registered with the operating system. The first thing to try in correcting the problem is to unregister and reregister Word with Windows. From the command line, use the following command:
"C:\Program Files\Microsoft Office\Office\winword.exe" /unregserver
The quotes are necessary, but you may need to change the path so it reflects the location of the winword.exe file on your system. (You can use Windows’ Search tool to locate the path to the winword.exe file.) The /unregserver switch “unhooks” all the references to Word in the Windows Registry. You should then, immediately, use the following command:
"C:\Program Files\Microsoft Office\Office\winword.exe" /regserver
This command causes Word to rewrite all its Registry keys and to reassociate itself with document and template files.