The Rich20.dll file contains the library code for the Microsoft Rich controls used by the Nimda virus. Current RichXX file names are associated with the following versions:
Version 1.0 = Riched32.dll
Version 2.0 = Riched20.dll
Version 3.0 = Riched20.dll The following list describes which versions of Rich Edit are included in which releases Microsoft? Windows?:
Windows XP = Includes Rich Edit 3.0 with a Rich Edit 1.0 emulator.
Windows Me = Includes Rich Edit 1.0 and 3.0.
Windows 2000 = Includes Rich Edit 3.0 with a Rich Edit 1.0 emulator.
Windows NT 4.0 = Includes Rich Edit 1.0 and 2.0.
Windows 98 = Includes Rich Edit 1.0 and 2.0.
Windows 95 = Includes only Rich Edit 1.0. However, Riched20.dll is compatible with Windows 95 and may be installed by an application that requires it. Antivirus software will not delete or remove files unless they contain malicious code, thus the Rich20.dll files will not be removed. If the virus is still present in the directory, then YES the virus will start all over. IF the virus has been cleaned from RAM (system memory) and the hard drive/files are clean, NO the Rich20.dll file will do no damage. Of course, proper administrative duties would include the removal of the Rich20.dll files since the antivirus program will not delete them.
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