Updating component registration error
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The difficulties include conflicts between DLL versions, difficulty in obtaining required DLLs, and having many unnecessary DLL copies. A particular version of a library can be compatible with some programs that use it and incompatible with others.Solutions to these problems were known even while Microsoft was writing the DLL system. Windows has been particularly vulnerable to this because of its emphasis on dynamic linking of C libraries and Object Linking and Embedding (OLE) objects.
This contrasts with static libraries, which are functionally similar but copy the code directly into the application.
particularly legacy 16-bit editions which all run in a single memory space.
DLL Hell can manifest itself in many different ways in which applications do not launch or work correctly.
(For 32-bit and 64-bit versions of Windows, inter-process sharing occurs only where different executables load a module from exactly the same directory; the code but not the stack is shared between processes through a process called "memory mapping".) Thus, even when the desired DLL is located in a directory where it can be expected to be found, such as in the system directory or the application directory, neither of these instances will be used if another application has started with an incompatible version from a third directory.
This issue can manifest itself as a 16-bit application error that occurs only when applications are started in a specific order.
A key reason for the version incompatibility is the structure of the DLL file.
The file contains a directory of the individual methods (procedures, routines, etc.) contained within the DLL and the types of data they take and return.Before Windows 2000, Windows was vulnerable to this because the COM class table was shared across all users and processes.Only one COM object in one DLL/EXE could be declared as having a specific global COM Class ID on a system.A common and troublesome problem occurs when a newly installed program overwrites a working system DLL with an earlier, incompatible version.Early examples of this were the libraries for Windows 3.1: Microsoft-created libraries that third party publishers would distribute with their software, but each distributing the version they developed with rather than the most recent version.If any program needed to create an instance of that class, it got whatever was the current centrally registered implementation.