Experts: Windows 7 at risk from legacy flaw

"For example, malicious code writers could name a 'virus.exe' file as 'virus.txt.exe' or 'virus.jpg.exe', he said. Windows Explorer would then hide the .exe part of the filename, meaning that the user would only see 'virus.txt' or 'virus.jpg'. Additionally, virus writers would change the icon displayed with the file in Windows Explorer so it looked like the icon of a text file or an image. Users might then click on the disguised file."

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