What are DLLs and how to fix them?

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DLL (Dynamic-Link Library) – a kind of computer library, in a file with the extension DLL, OCX, CPL or DRV.

What is the library mentioned? Imagine that program A and program B use a function, e.g. voice recognition, together. The creators of these programs do not necessarily have to have advanced knowledge about human speech. Perhaps application A is just a simple, free language learning tool, supported by modern technology. The DLL magic comes in here. All you have to do is use the built-in functions of the operating system (that is, one of the DLL files provided with Windows) or attach an external manufacturer’s DLL file. Such a file contains a library, in other words – a set of functionalities for use by others. This set can not be modified in most cases, it is a closed whole.

In short, it can be said that a DLL is a collection of resources that various applications can use. These resources can have various character (functions, icons, graphics, data) and implement a wide spectrum of activities, limited only by the imagination and needs of the creator. In addition, it has to be mentioned that DLL technology does not burden memory with libraries that we do not use at the moment (this is dynamic linking) and does not load the library repeatedly if it is used by many programs (this is sharing). It has its advantages, it also has disadvantages, captured with the humorous term “DLL hell”. Some developers deliberately disclaim the benefits of using DLLs to increase the reliability of applications they write. The sharing and dynamic linking can be used selectively, and this often happens.

  • We distinguish the following types of files containing DLL libraries:
  • .Cpl files – applets of the Control Panel.
  • .Dll files – ordinary DLLs.
  • .Drv files – drivers.
  • .Ocx files – ActiveX controls.
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Problems with DLL, OCX, and DRV files

Since the release of Windows, problems with dynamically linked libraries have become a real problem. Version conflicts, missing DLL files, infected code substituted by malicious software, blue screens, “closed” viruses in ActiveX controls – all this gave Microsoft a bad reputation. In the latest versions of Windows, this situation is getting better and better, access to key libraries is only available to administrators, which in some cases excludes the attack of viruses or Trojans. Digitally signed and intensively tested drivers do not cause the computers to hang up again, although the number of models available on the market makes you dizzy.

If you have a problem with DLLs, you can download the missing DLL file here.

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