Repair, modify and self- repair operations. Deployment via systems management software for example SCCM (avoids huge, cached MSI files in C: \Windows\Installer since files are extracted from internal cabs)Corporate application repackaging. In essence the admin install is important for: Extracting and inspecting the installer files. It is recommended to read more about admin- installs since it is a useful concept, and I have written a post on stackoverflow: What is the purpose of administrative installation initiated using msiexec /a? All of these are handled correctly by doing an admin install. Always prefer to run the actual admin install over any hacky zip extractions.Īs to compression, there are actually three different compression algorithms used for the cab files inside the MSI file format: MSZip, LZX, and Storing (uncompressed). Note that running an admin install versus using a zip tool to extract the files is very different! The latter will not adjust the media layout of the media table so that the package is set to use external source files - which is the correct way. This ensures that the source files are always available for any repair operations. It is basically intended as a way to create a network installation point from which the install can be run on many target computers. This is called an administrative installation.
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