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An app whose Windows Installer entries are damaged cannot be uninstalled or reinstalled via the normal means. The Windows Installer CleanUp utility removes all files and registry settings associated with an app's Windows Installer database, allowing it to be reinstalled. The utility only changes registry values and files associated with Windows ...
Because a file is the most common type of key path, the term key file is commonly used. A component can contain at most one key path; if a component has no explicit key path, the component's destination folder is taken to be the key path. When an MSI-based program is launched, Windows Installer checks the existence of key paths.
The file manager has a toolbar with options to create an archive, extract an archive, test an archive to detect errors, copy, move, and delete files, and open a file properties menu exclusive to 7-Zip. The file manager, by default, displays hidden files because it does not follow Windows Explorer's policies.
The recently opened file list in Microsoft Office applications Revo Uninstaller can also irrecoverably delete files . A portable version is available that can be run without installing onto or modifying the system, in particular from external storage media such as USB and network drives .
The utility searches files that are no longer of any use, and enables the user to delete them. The candidates for deletion are categorized as: "Windows Update Cleanup": Copies of Windows updates that are already installed "Microsoft Defender Antivirus": Temporary files that Microsoft Defender Antivirus no longer needs
The program includes a registry cleaner to locate and correct problems in the Windows registry, such as missing references to shared DLLs, unused registration entries for file extensions, and missing references to application paths. [9] CCleaner 2.27 and later can wipe the MFT free space of a drive, or the entire drive.
In Windows Vista, Windows 7 and Windows 10, System File Checker is integrated with Windows Resource Protection (WRP), which protects registry keys and folders as well as critical system files. Under Windows Vista, sfc.exe can be used to check specific folder paths, including the Windows folder and the boot folder.
A poorly written or misconfigured installer can therefore downgrade a system library on legacy versions of Windows, on which Windows File Protection or Windows Resource Protection does not roll back the change. On Windows Vista and later, only the "trusted installer" account can make changes to core operating-system libraries.