NOTE 2:
All systems with Internet Explorer 4.0 or 4.01 will have the associated version of Comctl32.dll and Shlwapi.dll (4.71 or 4.72, respectively). However, for systems prior to Windows 98, Internet Explorer 4.0 and 4.01 can be installed with or without the integrated Shell. If they are installed with the integrated Shell, the associated version of Shell32.dll will be installed. If they are installed without the integrated Shell, Shell32.dll is not updated. No other versions of Internet Explorer update Shell32.dll. In other words, the presence of version 4.71 or 4.72 of Comctl32.dll or Shlwapi.dll on a system does not guarantee that Shell32.dll has the same version number. All Windows 98 systems have version 4.72 of Shell32.dll.
NOTE 3:
Version 5.80 of Comctl32.dll and version 5.0 of Shlwapi.dll are distributed with Internet Explorer 5. They will be found on all systems on which Internet Explorer 5 is installed, except Windows 2000. Internet Explorer 5 does not update the Shell, so version 5.0 of Shell32.dll will not be found on Windows NT, Windows 95, or Windows 98 systems. Version 5.0 of Shell32.dll will be distributed with Windows 2000 and Windows Me, along with version 5.0 of Shlwapi.dll, and version 5.81 of Comctl32.dll.
NOTE 4:
ComCtl32.dll version 6 is not redistributable. If you want your application to use ComCtl32.dll version 6, you must add an application manifest that indicates that version 6 should be used if it is available.
Source: MSDN
DGui Main Import Module.
DLL Versions and prerequisites:
NOTE 1:
The 4.00 versions of Shell32.dll and Comctl32.dll are found on the original versions of Windows 95 and Windows NT 4.0. New versions of Commctl.dll were shipped with all Internet Explorer releases. Shlwapi.dll shipped with Internet Explorer 4.0, so its initial version number here is 4.71. The Shell was not updated with the Internet Explorer 3.0 release, so Shell32.dll does not have a version 4.70. While Shell32.dll versions 4.71 and 4.72 were shipped with the corresponding Internet Explorer releases, they were not necessarily installed (see note 2). For subsequent releases, the version numbers for the three DLLs are not identical. In general, you should assume that all three DLLs may have different version numbers, and test each one separately.