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According to the information on our website the most popular versions of this software are: 4.1, 4.0 and 3.0. Viper is a program which is commonly known as ViperClient.exe, WinCobra.exe, _41A4E8A41D82AF41D8DB67.exe, zuludemo.exe and zulu.exe, etc. Viper can be launched on Windows XP/XP Professional/Vista/7/8/10 32-bit.