To help prevent against opening rogue files with double extensions, enable viewing file extensions from Explorer.

By default, Windows 7 hides the file extensions of known file types in Explorer views. The reasoning - this keeps the display clean, as often a file's icon signifies its type.

However, as in in Windows Vista and earlier, this default setting is a potential security risk. It's possible that you can receive a file via e-mail with an extension of ".txt", or a file with a Notepad icon. Unfortunately, this file could have a hidden second extension, meaning that if you double-click the file, you may actually execute spyware or other malware instead!...

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