document: Much ado about nothing : Win32.Perrun JPEG files do not contain any executable code and it is impossible to infect such files . The author takes a look at the details surrounding the Win32.Perrun virus and make clear exactly what it does . The main virus feature is its ability to affect JPEG image files -LRB- compressed graphic images -RRB- and to spread via affected JPEG files . The virus affects , or modifies , or alters JPEG files but does not `` infect '' them
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