![]() There are 3 issues to consider carefully in the above command line: RUNDLL.EXE SETUPX.DLL,InstallHinfSection 132 C:\WINDOWS\INF\SHELL.INF The command line for Rundll is as follows: ![]() If you pass the wrong type of DLL to Rundll or Rundll32, it may fail to run without indicating any error messages. ![]() Rundll loads and runs 16-bit DLLs, whereas Rundll32 loads and runs 32-bit DLLs. Note that Windows NT 4.0 ships only with the Rundll32 utility program and supports only Rundll32. But the functionality provided by them is sufficiently generic that they are now available for general use. The Rundll and Rundll32 utility programs were originally designed only for internal use at Microsoft. There is no support for Rundll (the Win16 utility) on either platform. Windows NT 4.0 and Windows 2000 ship with only Rundll32. This article provides more details on the use of Rundll and Rundll32 programs under Windows NT and Windows 95. The programs only allow you to call functions from a DLL that are explicitly written to be called by them. For example, you can not use these utility programs to call the Win32 API (Application Programming Interface) calls exported from the system DLLs. However, Rundll and Rundll32 programs do not allow you to call any exported function from any DLL. Windows 95 and Windows 98 contains two command-line utility programs named Rundll.exe and Rundll32.exe that allow you to invoke a function exported from a DLL, either 16-bit or 32-bit.
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