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I use several plug-ins, but for documents and similar, I use the plug-in uLister 4.0.0 by Egor Vlaznev, a powerful document viewer which can open more than 500 file formats, using the Oracle Outside In Technology Viewer.

Links
uLister:
http://www.totalcmd.net/plugring/oilister.html
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I´m a TotalCommander (www.ghisler.com) user, the best File Manager (and more...). And with the built-in Lister QuickView I can see pratically any format - text documents, spreadsheets, presentatios, databases, graphics, etc - without opening the related programs (offices, graphics, etc), with plug ...