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In short, normally, programs are removed using an uninstaller, reading the documentation written during their installation.
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The uninstaller goes through the log file and undoes all the changes done during installation. When a user tries to remove a program through the Add/Remove tool, Windows looks for the registered uninstaller inside the registry and executes it. During installation, all these operations for installing are logged in a special log file (for example, setup.log), and the installation program usually puts that file inside the application's folder along with the uninstaller.After this is done, a key is added to the Windows Registry, where the Windows Add/Remove tool looks for installed programs.
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For example, if you install Microsoft Word, then you will also be able to open Microsoft Word documents. The installer can make changes inside the Registry if a shared library needs to be registered or if certain types of files need to be associated with the program being installed. This is a database where all the settings and options for the operating system are stored, as well as for any applications or OS components that are programmed to use it.