A. When you install Internet Explorer 4 or 5 it stores the previous version of Internet Explorer in

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\IE Setup\Setup\PreviousIESysFile for IE 5.0 installations

or

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\IE4\Setup\PreviousIESysFile for IE 4.0 installatinos

The possible values are:

Value Version
4.70.0.1155 3.0
4.70.0.1158 3.0
4.70.0.1215 3.01
4.70.0.1300 3.02
4.72.3110.3 Windows 98 Internet Explorer